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Q.

The resistance of a moving coil galvanometer is 10 Ω and gives a full scale deflection for a current 5 mA  The series resistance required to convert it into a voltmeter to read maximum 100 volt is

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a

19,990 Ω

b

19980 Ω

c

20010 Ω

d

20000 Ω

answer is A.

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Detailed Solution

See fig. we know that ig=V(R+G)5×10−3=100R+10Solving, we get R = 19990 Ω
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