The magnet moves as shown. The field of the magnet through the coil is:

Question

Question:

The magnet moves as shown. The field of the magnet through the coil is:

(a) to the left and the primary flux through the coil is decreasing.
(b) to the right and the primary flux through the coil is decreasing.
(c) to the right and the primary flux through the coil is increasing.
(b) to the left and the primary flux through the coil is increasing

Answer:

Magnetic Flux:
A bar magnet kept nearby on the axis of a coil causes electric field of bar magnet to pass through the core of the coil. The direction of field is based on N-S of the bar magnet. By moving the magnet towards or away from the coil, flux of magnetic field can be changed.

Answer:
Flux through the loop decreases as the magnet is withdrawn.
There fore to prevent this change(Lenze’s Law) theinduced current flows in such direction that a north pole is induced at the left side of the coil andit attracts the south pole of theretreating bar magnet.
Hence the current as seen from the retreating bar magnet side is counterclockwise
Therefore this time theinduced current flows from right to left in the current meter.
Answer is A) to the left and the primary flux through the coil is decreasing

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Sam Professor 2 years 1 Answer 1063 views 0

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