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Question

A galvanometer of resistance 50 Ω gives full scale deflection with a current of 0.5 mA. The value of resistance to be connected in series with it, in order to convert it into a voltmeter of range 10 volt, will be

A
1,995 Ω
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B
2,000 Ω
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C
19,950 Ω
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D
20,000 Ω
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Solution

The correct option is C 19,950 Ω
Now , galvanometer resistance is 50 Ω
and full scale deflection current is 0.5 mA
Now we have to convert it into a voltmeter of range 10 V
therefore, resistance of galvanometer is to be made,
R=VIfull scale=100.5×103=20000 Ω
therefore, additional resistance in series required is Rs=RRgalvo
Rs=2000050=19950 Ω
option(C)

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