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Q.

Is it true that if one key is closed, the galvanometer needle deflects momentarily in one direction?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
When the key is turned off, the galvanometer needle turns briefly to one side. This is because when the key is locked, the magnetic field lines around the coil increase temporarily. This causes the advertised current to flow in, resulting in the deviation occurring in one direction.
 
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