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Question

A moving coil galvanometer has a resistance of 900 Ω. In order to send only 10% of the main current through this galvanometer, the resistance of the required shunt is:

A
0.9 Ω
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B
100 Ω
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C
405 Ω
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D
90 Ω
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Solution

The correct option is D 100 Ω
Since the 10% current is required to pass through galvanometer, and 90% through the shunt, the ratio of the resistances must be RshuntRGal=19
Thus Rshunt=100 Ω

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