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Question

A galvanometer of resistance 100 ohm gives full scale deflection with 5 millampere current. To convert it into a 5 volt range voltmeter, the value of resistance connected in series is :

A
900 Ω
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B
9999 Ω
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C
10000 Ω
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D
1 MΩ
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Solution

The correct option is A 900 Ω
Let resistance x be connected in series,
= V1V2=R1Req=R1R1+x
5×103×1005=100100+x [V=iR]
100+x=1000
x=900Ω

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