Q.

Deflection of galvanometer in the circuit id 71 divisions. A shunt of15Ω is connected parallel to galvanometer and value of R is adjusted such that main current remains the same. If the deflection in the galvanometer falls to 158 divisions then the resistance G of galvanometer is ( in ohm)

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a

56

b

1423

c

1123

d

40       

answer is C.

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Detailed Solution

S=Gig115=G(71151)

15=G×157115

G=56Ω

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