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미국 개발자249

[PHYS] Example Question: In the figure below, let R = 7.50 Ω, L = 2.10 mH, and C = 1.90 µF. Example Question # Question In the figure below, let R = 7.50 Ω, L = 2.10 mH, and C = 1.90 µF. (a) Calculate the frequency of the damped oscillation of the circuit when the switch is thrown to position b. (b) What is the critical resistance for damped oscillations? # Explanation 2022. 6. 27.
[PHYS] Example Question: A 102-turn square coil of side 20.0 cm rotates about a vertical axis at w = 1.25*10^3 rev/min as indicated in the figure below. The horizontal component of Earth's magnetic field at the coil's location is equal to 2.00*10^(-5)T. Example Question # Question A 102-turn square coil of side 20.0 cm rotates about a vertical axis at w = 1.25*10^3 rev/min as indicated in the figure below. The horizontal component of Earth's magnetic field at the coil's location is equal to 2.00*10^(-5)T. # Explanation 2022. 6. 26.
[PHYS] Example Question: A rectangular loop of area A = 0.150 m2 is placed in a region where the magnetic field is perpendicular to the plane of the loop. The magnitude of the field is allowed to vary in time according to B = 0.400e−t/2.00, where B is.. Example Question # Question A rectangular loop of area A = 0.150 m2 is placed in a region where the magnetic field is perpendicular to the plane of the loop. The magnitude of the field is allowed to vary in time according to B = 0.400e−t/2.00, where B is in teslas and t is in seconds. The field has the constant value 0.400 T for t < 0. What is the value for eplison at t = 8.000 s? # Explanation 2022. 6. 26.
[PHYS] Example Question: The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor i.. Example Question # Question The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor is I1 = 1.12 A out of the page and the current in the outer conductor is I2 = 3.12 A into the page. Assuming the distance d = 1.00 mm, answer t.. 2022. 6. 26.
[PHYS] Example Question: In the figure below, the current in the long, straight wire is I1 = 7.00 A and the wire lies in the plane of the rectangular loop, which carries a current I2 = 10.0 A. The dimensions in the figure are c = 0.100 m, a = 0.150 m, a.. Example Question # Question In the figure below, the current in the long, straight wire is I1 = 7.00 A and the wire lies in the plane of the rectangular loop, which carries a current I2 = 10.0 A. The dimensions in the figure are c = 0.100 m, a = 0.150 m, and L = 0.460 m. Find the magnitude and direction of the net force exerted on the loop by the magnetic field created by the wire. # Explanation 2022. 6. 26.
[PHYS] Example Question: Two long, parallel wires carry currents of I1 = 3.35 A and I2 = 4.60 A in the directions indicated in the figure below, where d = 25.0 cm. (Take the positive x direction to be to the right.) Example Question # Question Two long, parallel wires carry currents of I1 = 3.35 A and I2 = 4.60 A in the directions indicated in the figure below, where d = 25.0 cm. (Take the positive x direction to be to the right.) Find the magnitude and direction of the magnetic field at a point midway between the wires. # Explanation Find the magnitude and direction of the magnetic field at a point midway .. 2022. 6. 26.
[PHYS] Example Question: A current path shaped as shown in the figure produces a magnetic field at P, the center of the arc. If the arc subtends an angle of 𝜃 = 25.0° and the radius of the arc is 0.400 m, what are the magnitude and direction of the .. Example Question # Question A current path shaped as shown in the figure produces a magnetic field at P, the center of the arc. If the arc subtends an angle of 𝜃 = 25.0° and the radius of the arc is 0.400 m, what are the magnitude and direction of the field produced at P if the current is 3.00 A? # Explanation 2022. 6. 26.
[PHYS] Example Question: A conductor consists of a circular loop of radius R = 30.0 cm and two long, straight sections as shown in the figure below. The wire lies in the plane of the screen and carries a current I = 2.70 A. Find the magnetic field at th.. Example Question # Question A conductor consists of a circular loop of radius R = 30.0 cm and two long, straight sections as shown in the figure below. The wire lies in the plane of the screen and carries a current I = 2.70 A. Find the magnetic field at the center of the loop. # Exaplanation 2022. 6. 26.
[PHYS] Example Question: (a) A conducting loop in the shape of a square of edge length ℓ = 0.380 m carries a current I = 10.2 A as in the figure above. Calculate the magnitude and direction of the magnetic field at the center of the square. Example Question # Question (a) A conducting loop in the shape of a square of edge length ℓ = 0.380 m carries a current I = 10.2 A as in the figure above. Calculate the magnitude and direction of the magnetic field at the center of the square. (b) If this conductor is reshaped to form a circular loop and carries the same current, what is the value of the magnetic field at the center? # Explanati.. 2022. 6. 26.
[PHYS] Example Question: A technician wearing a brass bracelet enclosing area 0.00500 m2 places her hand in a solenoid whose magnetic field is 2.00 T directed perpendicular to the plane of the bracelet. The electrical resistance around the circumference.. Example Question # Question A technician wearing a brass bracelet enclosing area 0.00500 m2 places her hand in a solenoid whose magnetic field is 2.00 T directed perpendicular to the plane of the bracelet. The electrical resistance around the circumference of the bracelet is 0.0200 ohm. An unexpected power failure causes the field to drop to 0.60 T in a time of 24.0 ms. (a) Find the current indu.. 2022. 6. 25.
[PHYS] Example Question: The figure below shows a bar of mass m = 0.280 kg that can slide without friction on a pair of rails separated by a distance ℓ = 1.20 m and located on an inclined plane that makes an angle 𝜃 = 26.0° with respect to the gro.. Example Question # Question The figure below shows a bar of mass m = 0.280 kg that can slide without friction on a pair of rails separated by a distance ℓ = 1.20 m and located on an inclined plane that makes an angle 𝜃 = 26.0° with respect to the ground. The resistance of the resistor is R = 3.90 Ω and a uniform magnetic field of magnitude B = 0.500 T is directed downward, perpendicular to the g.. 2022. 6. 25.
[PHYS] Example Question: A toroid having a rectangular cross section (a = 2.00 cm by b = 3.00 cm) and inner radius R = 3.75 cm consists of 500 turns of wire that carries a sinusoidal current I = Imax sin 𝜔t, with Imax = 55.0 A and a frequency f = .. Example Question # Question A toroid having a rectangular cross section (a = 2.00 cm by b = 3.00 cm) and inner radius R = 3.75 cm consists of 500 turns of wire that carries a sinusoidal current I = Imax sin 𝜔t, with Imax = 55.0 A and a frequency f = 𝜔/2𝜋 = 60.0 Hz. A coil that consists of 20 turns of wire links with the toroid, as shown in the figure. Determine the emf induced in the coil as a f.. 2022. 6. 25.
[PHYS] Example Question: A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. Example Question # Question A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. (a) Determine the magnetic flux through the loop due to the current I. (Use any variable stated above along with the following as necessary: 𝜇0 and 𝜋.) (b) Suppose the current is changing with time according .. 2022. 6. 25.
[PHYS] Example Question: In Niels Bohr's 1913 model of the atom, the electron is in a circular orbit around a nucleus. An electron is 5.40 10-11 m from a nucleus traveling in a circular orbit with a speed of 2.50 106 m/s. Example Question # Question In Niels Bohr's 1913 model of the atom, the electron is in a circular orbit around a nucleus. An electron is 5.40*10^(-11) m from a nucleus traveling in a circular orbit with a speed of 2.50*10^6 m/s. What is the magnitude of the magnetic moment due to the electron's motion? # Explanation What is the magnitude of the magnetic moment due to the electron's motion? 2022. 6. 20.
[PHYS] Example Question: For the circuit shown below, the ideal voltmeter reads 5.30 V and the ideal ammeter reads 2.60 mA. Find the following. Example Question # Question For the circuit shown below, the ideal voltmeter reads 5.30 V and the ideal ammeter reads 2.60 mA. Find the following. # Explanation 2022. 6. 20.
[PHYS] Example Question: In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. Take e m f = 10.0 V, R1 = 42.0 kΩ, R2 = 120 kΩ, and C = 12.0 𝜇F. Example Question # Question In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. Take E = 10.0 V, R1 = 42.0 kΩ, R2 = 120 kΩ, and C = 12.0 𝜇F. Determine the time constant before the switch is closed. Determine the time constant after the switch is closed. Let the switch be closed at t = 0. Determine the current in the switch as a function of .. 2022. 6. 20.
[PHYS] Example Question: A battery with e m f = 2.00 V and no internal resistance supplies current to the circuit shown in the figure below. When the double-throw switch S is open as shown in the figure, the current in the battery is 1.01 mA. When the s.. Example Question # Question A battery with E = 2.00 V and no internal resistance supplies current to the circuit shown in the figure below. When the double-throw switch S is open as shown in the figure, the current in the battery is 1.01 mA. When the switch is closed in position a, the current in the battery is 1.21 mA. When the switch is closed in position b, the current in the battery is 2.05 .. 2022. 6. 20.
[PHYS] Example Question: Consider the circuit shown in the figure below. (Let R = 12.0 Ω.) Example Question # Question Consider the circuit shown in the figure below. (Let R = 12.0 Ω.) Find the current in the 12.0-Ω resistor. Find the potential difference between points a and b. # subTitle Find the current in the 12.0-Ω resistor. Find the potential difference between points a and b. 2022. 6. 20.
[PHYS] Example Question: While taking photographs in Death Valley on a day when the temperature is 53.0°C, Bill Hiker finds that a certain voltage applied to a copper wire produces a current of 1.10 A. Bill then travels to Antarctica and applies the sa.. Example Question # Question While taking photographs in Death Valley on a day when the temperature is 53.0°C, Bill Hiker finds that a certain voltage applied to a copper wire produces a current of 1.10 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current does he register there if the temperature is −88.0°C? Assume that no change occurs in the wire's shap.. 2022. 6. 20.
[PHYS] Example Question: Two capacitors, C1 = 6.06 µF and C2 = 3.22 µF, are connected in parallel, then the combination is connected to a 250 V battery. When the capacitors are charged, each one is removed from the circuit. Next, the two charged capac.. Example Question # Question Two capacitors, C1 = 6.06 µF and C2 = 3.22 µF, are connected in parallel, then the combination is connected to a 250 V battery. When the capacitors are charged, each one is removed from the circuit. Next, the two charged capacitors are connected to each other so that the positive plate of one capacitor is connected to the negative plate of the other capacitor. What is.. 2022. 6. 20.
[PHYS] Example Question: A uniform electric field E = 2550 V/m exists within a certain region. What volume of space contains an energy equal to 1.10 ✕ 10-7 J? Express your answer in cubic meters and in liters. Example Question # Question A uniform electric field E = 2550 V/m exists within a certain region. What volume of space contains an energy equal to 1.10 ✕ 10-7 J? Express your answer in cubic meters and in liters. # Explanation 2022. 6. 20.
[PHYS] Example Question: A nonconducting sphere has mass 80.8 g and radius 19.8 cm. A flat, compact coil of wire with seven turns is wrapped tightly around it, with each turn concentric with the sphere. The sphere is placed on an inclined plane that slo.. Example Question # Question A nonconducting sphere has mass 80.8 g and radius 19.8 cm. A flat, compact coil of wire with seven turns is wrapped tightly around it, with each turn concentric with the sphere. The sphere is placed on an inclined plane that slopes downward to the left (see figure below), making an angle 𝜃 with the horizontal so that the coil is parallel to the inclined plane. A unifo.. 2022. 6. 20.
[PHYS] Example Question: The upper portion of the circuit in the figure below is fixed. The horizontal wire at the bottom has a mass of 10.0 g and is 5.00 cm long. This wire hangs in the gravitational field of the Earth from identical light springs conn.. Example Question # Question The upper portion of the circuit in the figure below is fixed. The horizontal wire at the bottom has a mass of 10.0 g and is 5.00 cm long. This wire hangs in the gravitational field of the Earth from identical light springs connected to the upper portion of the circuit. The springs stretch 0.540 cm under the weight of the wire, and the circuit has a total resistance o.. 2022. 6. 20.
[PHYS] Example Question: A particle with positive charge q = 3.84 10-18 C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field and a uniform electric field exist. Example Question # Question A particle with positive charge q = 3.84*10^-(18) C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field and a uniform electric field exist. # Explanation A particle with positive charge q = 3.84*10^-(18) C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field .. 2022. 6. 20.
[PHYS] Example Question: A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the l.. Example Question # Question A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and subject to this external magnetic field. The permanent magnet has a magnetic moment of 0.12 A · m2. The orientatio.. 2022. 6. 20.
[PHYS] Example Question: In the figure below, the cube is 42.4 cm on each edge. Four straight segments of wire—ab, bc, cd, and da—form a closed loop that carries a current I = 5.30 A in the direction shown. A uniform magnetic field of magnitude B = .. Example Question # Question In the figure below, the cube is 42.4 cm on each edge. Four straight segments of wire—ab, bc, cd, and da—form a closed loop that carries a current I = 5.30 A in the direction shown. A uniform magnetic field of magnitude B = 0.022 T is in the positive y direction. Determine the magnetic force on each segment. ab bc cd da # Explanation ab bc cd da 2022. 6. 20.
[PHYS] Example Question: A 290-W heating coil designed to operate from 110 V is made of Nichrome wire 0.230 mm in diameter. (Assume 𝜌 = 1.50 10-6 Ω · m, and 𝛼 = 4.000 10-4(°C)−1 for Nichrome.) Example Question # Question A 290-W heating coil designed to operate from 110 V is made of Nichrome wire 0.230 mm in diameter. (Assume 𝜌 = 1.50 * 10^(-6) Ω · m, and 𝛼 = 4.000 * 10^(-4)(°C)^(−1) for Nichrome.) (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. (b) Now consider the variation of resistivity with temperature. What power i.. 2022. 6. 20.
[PHYS] Example Question: The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. Example Question # Question The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. (a) At this average price, calculate the cost of leaving a 40-W porch light on for two weeks while you are on vacation? (b) At this average price, calculate the cost of making a piece of dark toast in.. 2022. 6. 20.
[PHYS] Example Question: The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm2 varies with time according to the equation q = 7t^3 + 3t + 6, where t is in seconds. Example Question # Question The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm^2 varies with time according to the equation q = 7t^3 + 3t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 0.900 s? (b) What is the value of the current density? # Explanation (a) What is the instantaneous current through the surface at.. 2022. 6. 20.
[PHYS] Example Question: A 340-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,020 A. If the conductor is copper with a free charge density of 8.50 1028 electrons per cubic meter, how many years does it take one.. Example Question # Question A 340-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,020 A. If the conductor is copper with a free charge density of 8.50 * 10^(28) electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (Use 3.156 * 10^7 for the number of seconds in a year.) # Explanation 2022. 6. 20.
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