A coil of insulated copper wire is connected to a galvanometer

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asked Jan 23, 2018 in Physics by Kundan kumar (49,132 points) 34 379 1010

A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil (ii) withdrawn from inside the coil (iii) held stationary inside of coil?

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answered Jan 23, 2018 by Vikash Kumar (144,729 points) 8 11 21
edited Jan 30, 2018 by faiz
 
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(i) When a bar magnet is pushed into the coil, a momentary deflection is observed in the galvanometer. This deflection indicates that a momentary current is produced in the coil.
(ii) When a bar magnet is held stationary inside the coil, there is no deflection in the galvanometer. It indicates that no current is produced in the coil.
(iii) When a bar magnet is withdrawn from the coil, the deflection of the galvanometer is in opposite direction. It indicates that a current an opposite direction is produced.

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