First slide

Moving coil Galvanometer

Question

A voltmeter has resistance of $2000 Ω$ and it can measure upto 2 V. If we want to increase its range to 10 V then the required resistance in series will be

Easy

A

$2000 Ω$
B

$4000 Ω$
C

$6000 Ω$
D

$8000 Ω$

Solution

Here, $n = \frac{10}{2} = 5$
$∴ R = (n - 1) G = (5 - 1) 2000 = 8000 Ω$

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