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Q.

A galvanometer whose resistance is 100 ohm has 25 divisions in it . When a current of 4×10−4A 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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Detailed Solution

Full deflection current in galvanometer ,  Ig=4×10−4×25=10-2A  To work as Voltmeter V=ig(G+R) ⇒ 2.5=100+R10−2 ⇒R=150Ω
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A galvanometer whose resistance is 100 ohm has 25 divisions in it . When a current of 4×10−4A 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