A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 × 10⁻⁴ A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of

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(1) 200 ohm. I_g = 25 × 4 × 10⁻⁴ = 10⁻² A. Total resistance = (2.5)/(10⁻²) = 250 Ω. Series resistance = 250 - 50 = 200 Ω.

A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 × 10⁻⁴ A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of

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