Question

a galvanometer is converted into voltmeter to increase its range by a factor of 40 if the voltmeter resistance is 2000 volt the resistance of the Galvanometer is what tell me the exact number​

Answer 1

Resistance of galvanometer is R = 50 ohms

Explanation:

Given data:

Range is change by factor 40

Voltmeter resistance is 2000 volt

if X is considered to be series resistance and R as galvanometer resistance then resistance of voltmeter is

$2000 =  R + X$  ....1

from information provided in the question we hve

$\frac{R}{R+X} =\frac{1}{40}$    ....2

from 1 and 2 we have

$\frac{R}{2000} = \frac{1}{40}$

R = 50 ohms