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# College Physics Reasoning and Relationships

Physics & Astronomy

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## Quiz 21 : Magnetic Induction

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?
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B

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

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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C

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
The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from to in 0.47 s. If the resistance of the loop is 0.31 , what is the current in the loop?
Multiple Choice
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
Electricity may be generated by rotating a loop of wire between the poles of a magnet. The induced current is least when:
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A straight wire of length 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
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
A straight wire of length 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
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
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
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
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
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
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