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Q.

When a galvanometer is shunted with 4Ω resistance, the deflection is reduced to one fifth. If the galvanometer is further shunted with  2Ω wire, the deflection will be (the main current remains the same)

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a

59 of the deflection when shunted with 4Ω only

b

513 of the deflection when shunted with 4Ω only

c

113 of the original deflection only

d

19 of the original deflection only

answer is B.

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Detailed Solution

I/5=I(4)G+4G+4=20G=16ΩCASE II :-I'=I4/316+43=I13
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