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In order to i...

Question

In order to increase range of ammeter, value of shunt resistance $R_{s}$ is

A

increased

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B

decreased

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C

remain same

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D

none of these

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Solution

The correct option is B decreased

Current through galvanometer is

$I_{g} = \frac{R_{s}}{R_{s} + R_{g}} I$

$⟹ I = \frac{R_{s} + R_{g}}{R_{s}} I_{g}$

$⟹ I = (1 + \frac{R_{g}}{R_{s}}) I_{g}$

Hence on decreasing $R_{s}$ for same galvanometer, its range can be increased.

Answer-(B)

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