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Please send solution to this question from current electricity

Please send solution to this question from current electricity

Question Image
Grade:12

1 Answers

Khimraj
3007 Points
3 years ago
Let resistance of voltmeter is R and current through voltmeter is I.
Then initial condition
V = I*R  – ( 1)
And final condition
100*V = I*(R +1980)  – (2).
Dividing equation (2) by equation (1).
100 = 1 + 1980/R
SO 99 = 1980/R.
Then R = 1980/99 = 20 ohm.
Hope it clears. If you like answer then please approve it.

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