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Q.

A galvanometer of resistance G is converted into a voltmeter of range 0 -1V by connecting a resistance R1 in series with it. The additional resistance that should be connected in series with R1 to increase the range of the voltmeter to 0 - 2 V will be

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a

R1

b

R1 -G

c

R1 +G

d

G

answer is B.

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Detailed Solution

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1=igR1+G

2=ig(G+R1+R2)
From the above equations we get R2=(G+R1)

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