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EMF and EMF Devices

A 1Ω voltme...

Question

A $1 Ω$ voltmeter has range 1V. Find the additional resistance which has to join in series in voltmeter to increase the range of voltmeter to 100 V :-

A

10

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B

\frac{1}{99}

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C

99

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D

100

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Solution

The correct option is C 99
Current $I = 1 / 1 = 1 A$
In 2nd case, resistance $R = 100 I = 100 Ω$
Thus additional resistance $= 100 - 1 = 99 Ω$

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