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Q.

To know the resistance G of a galvanometer by half deflection method, a battery of emf VE and resistance R is used to deflect the galvanometer by angle θ. If a shunt of resistance S in needed get half deflection then G,R and S are related by the equation

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a

S(R + G) = RG

b

2S(R + G) = RG

c

2S = G

d

2G = S

answer is A.

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Detailed Solution

12Current through galvano before shunting=Current through galvano after shunting

12VR+G=VR+GSG+SSG+S

⇒12VR+G=VSGS+RG+RS


After Solving we get, 

S(R+G)=RG

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