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College Physics Reasoning and Relationships

Physics & Astronomy

Quiz 21 :

Magnetic Induction

Quiz 21 :

Magnetic Induction

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Three loops of wire, one circular, one rectangular, and one square, are made from identical lengths of wire. If the loops are in the same increasing magnetic field perpendicular to the plane of the coils, which loop has the least induced emf?
Free
Multiple Choice
Answer:

Answer:

B

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The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from img to img in 0.47 s. What is the induced emf in the wire?
Free
Multiple Choice
Answer:

Answer:

A

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A uniform 1.5-T magnetic field passes perpendicularly through the plane of a wire loop 0.30 m2 in area. What flux passes through the loop?
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Multiple Choice
Answer:

Answer:

C

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A circular loop of wire has its radius doubled in time Δt. A uniform magnetic field is at an angle of 60° to the plane of the coil, and the magnetic field halves its intensity in the same time interval Δt. During this interval, what happens to the flux through the coil?
Multiple Choice
Answer:
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The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from img to img in 0.47 s. If the resistance of the loop is 0.31 , what is the current in the loop?
Multiple Choice
Answer:
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A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 6.00 m/s. What emf is induced across the ends of the wire?
Multiple Choice
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Electricity may be generated by rotating a loop of wire between the poles of a magnet. The induced current is least when:
Multiple Choice
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A straight wire of length img is oriented east-west and is in a magnetic field B pointing north. The wire is moving upward at a constant speed v. Which end of the rod is positively charged?
Multiple Choice
Answer:
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A metal rod is falling toward the surface of the Earth near the equator. As it falls, one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field. The rod is oriented so that:
Multiple Choice
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A straight wire of length img is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. If the resistance of the rod is R, what is the current through the rod?
Multiple Choice
Answer:
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A double loop of wire (making 2 turns) is in the x-y plane centered at the origin. A uniform magnetic field is increasing at a constant rate in the negative z direction. In which direction is the induced magnetic field in the loop?
Multiple Choice
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A coil is placed in a magnetic field and has a flux B through it. The coil is stressed so that its area reduces to 60% of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?
Multiple Choice
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An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 l04 T. If the induced potential between wingtips is 0.600 V, what is the plane's speed?
Multiple Choice
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Magnetism had been a known phenomenon for some time before its relation to electric currents was found. That a current in a wire produces a magnetic field was discovered by:
Multiple Choice
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A loop of area 0.250 m2 is in a uniform 0.0200-T magnetic field. If the flux through the loop is 3.21 10-3 T·m2, what angle does the normal to the plane of the loop make with the direction of the magnetic field?
Multiple Choice
Answer:
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A large jetliner with a wingspan of 40 m flies horizontally and due north at a speed of 300 m/s in a region where the magnetic field of the earth is 51 µT directed 24.1° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
Multiple Choice
Answer:
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A uniform 4.5-T magnetic field passes through the plane of a wire loop 0.20 m2 in area. What flux passes through the loop when the direction of the 4.5-T field is at a 30° angle to the normal of the loop plane?
Multiple Choice
Answer:
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The units T·m2/s are equivalent to:
Multiple Choice
Answer:
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A coil in a magnetic field encloses a flux of 0.256 T·m2 when the angle between the normal to the coil and the direction of the magnetic field is 70.0°. What flux would go through the coil if the angle were changed to 30.0°?
Multiple Choice
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A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
Multiple Choice
Answer:
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