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Questions  

In the following Wheatstone bridge, P/Q = R/S. If key K is closed, then the galvanometer will show deflection

a
in left side
b
in right side
c
no deflection
d
in either side

detailed solution

Correct option is C

Pressing the key does not disturb current in all resistances as the bridge is balanced. Therefore, deflection in the galvanometer in whatever direction it was, will stay.

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