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In the circuit shown in figure, reading of ammeter A will

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increase if S₁ is closed

decrease if S₁ is closed

increase if S₂ is closed

decrease if S₂ is closed

answer is A.

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Detailed Solution

By closing S₁ net external resistance will decrease. So, main current will increase.
By closing S₂, net emf will remain unchanged but net internal resistance will decrease. Hence, main current will increase.

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