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Question

20% of the main current passes through the galvanometer. If the resistance of the galvanometer is G, then the resistance of the shunt will be -

A
G50
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B
G4
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C
50G
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D
9G
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Solution

The correct option is B G4

i=i1+i2

i1=20% of i=0.2i

i2=0.8i

Now,

i1G=i2S

0.2i×G=0.8i×S

S=G4

Hence, option (B) is the correct answer.

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