In the circuit shown in figure, reading of ammeter A will
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a
increase if S1 is closed
b
decrease if S1 is closed
c
increase if S2 is closed
d
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.