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

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In the following Wheatstone bridge `P//Q = R//S`. If key `K` is closed, then the galvanometer will show deflection
image
A. In left side
B. In right side
C. No deflection
D. In either side
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Correct Answer - D
(d) 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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