A square loop of wire with a small resistance is moved with constant speed from

Question

A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the right. The self inductance of the loop is negligible.

TrueFalse Upon leaving the field, a counterclockwise current flows in the loop.
TrueFalse When entering the field the coil experiences a magnetic force to the left.
TrueFalse Upon entering the field, a counterclockwise current flows in the loop.
TrueFalse When leaving the field the coil experiences a magnetic force to the left.

A magnetic field is perpendicular to a 0.0387 m x 0.0599 m rectangular coil of wire that has 109 turns. In a time of 0.0525 s, an average emf of magnitude 1.66 V is induced in the coil. What is the magnitude of the change in the magnetic field?

The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select true or false for the current in the loop. (The compass directions are defined in the usual way.)

TrueFalse fig2: Loop moving South, no induced current.
TrueFalse fig1: Loop moving West, induced current 'a'.
TrueFalse fig1: Magnet moving East, induced current 'a'.
TrueFalse fig1: Magnet moving West, induced current 'a'.
TrueFalse fig2: Loop moving East, induced current 'b'.
TrueFalse fig2: Loop moving North, induced current 'b'.

A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the right. The self inductance of the loop is negligible. Upon leaving the field, a counterclockwise current flows in the loop. When entering the field the coil experiences a magnetic force to the left. Upon entering the field, a counterclockwise current flows in the loop. When leaving the field the coil experiences a magnetic force to the left. A magnetic field is perpendicular to a 0.0387 m x 0.0599 m rectangular coil of wire that has 109 turns. In a time of 0.0525 s, an average emf of magnitude 1.66 V is induced in the coil. What is the magnitude of the change in the magnetic field? The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select true or false for the current in the loop. (The compass directions are defined in the usual way.)

Explanation / Answer

1) True. When the loop is moving out of the field, the left hand side will be out ofthe magnetic field so no force will be on it

True. There is no changing flux, so there is no induced EMF

False. The current will travel counterclockwiseto counter the increase in flu

True. When the loop is moving out of the field, the left hand side will be out ofthe magnetic field so no force will be on it

2) True. since the flux is not changing through the loop, there is no inducedcurren

True. If the loop moves west, the same principle as the magnet moving eastapplies

True, if the magnet is moving east, less flux will travel through the loop.Thus, the induced current will be such as to gain flux

False. Using the right hand rule,more flux will be in the loop if current travels in the direction indicated by

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