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Q.

A galvanometer of resistance 2Ω  and having full scale deflection for a current of 100 mA can be converted into a voltmeter of range 5 V by connecting a resistance R in series with the galvanometer. The resistance R in ohm is :

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a

48

b

52

c

50

d

98

answer is D.

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Detailed Solution

52+R=100×10−3     ⇒ R=48Ω

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A galvanometer of resistance 2Ω  and having full scale deflection for a current of 100 mA can be converted into a voltmeter of range 5 V by connecting a resistance R in series with the galvanometer. The resistance R in ohm is :