A galvanometer of resistance 25Ω is connected to a battery of 2V along with a resistance of 3000Ω . In this case, a full-scale deflection of 30units is obtained in the galvanometer. In order to reduce this deflection to

Question

Quantrex Academy · Accepted Answer

Correct answer: 6050

The deflection in a galvanometer is directly proportional to the current.

First case:

$30x = \dfrac{2}{25 + 3000}$

Second case:

$10x = \dfrac{2}{25 + 3000 + R}$

$⇒ 3 = \dfrac{25 + 3000 + R}{25 + 3000}$

On solving, we get

$R = 6050Ω$

A galvanometer of resistance 25Ω is connected to a battery of 2V...

Correct answer

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