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Q.

A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 ×  10-4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

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a

2500   Ω  as  a  shunt

b

2450   Ω  as  a  shunt

c

2550   Ω in series

d

2450   Ω in series

answer is D.

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Detailed Solution

Full deflection current, ig = 25  ×  4  ×  10−4=100  ×  10−4  AR=Vig −G = 25100  ×  10−4 −50=2450  Ω  in  series
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A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 ×  10-4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of