An ammeter and a volt meter are joined in series to a cell. Their readings are A and V, respectively. If a resistance is now joined in parallel with the voltmeter, then

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both A and V will increase

A will increase, V will decrease

A will decrease, V will increase

both A and V will decrease

answer is D.

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Detailed Solution

When a resistance is joined in parallel with the voltmeter, the total resistance of the circuit decreases. Current will increase, so ammeter reading will increase. The equivalent resistance across the voltmeter decreases and hence its reading will decrease

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