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Q.

A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is pushed into the coil with its north pole entering first   ?


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a

There is a deflection in the galvanometer.

b

There is no deflection in the galvanometer.

c

This indicates the presence of current.

d

There is no current. 

answer is A.

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Detailed Solution

As we know that galvanometer is an instrument that can detect the presence of a current in a circuit. So when a bar magnet is pushed into the coil with its north pole entering first there is a momentary deflection in the coil . This also indicates the presence of current in the coil.
 
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