Question

In order to change the range of a galvanometer of G ohm resistance from V volt to nV volts what will be the value of resistance in ohm connected in series with it:
ans - (n-1) G​

Answer 1

Answer:

(n-1) G​ is the required answer.

Explanation:

Given

In order to change the range of a galvanometer of G ohm resistance from V volt to nV volts.

To find:

value of resistance in ohm connected in series with it:

Solution:

Let us consider that the resistance is connected in series with the voltmeter.

We know that Ohm's law is

V = IR

The voltage for galavonometer is nV.

The voltage for voltmeter is (n-1)V.

Thus for the galvaonemter ohms law will be given as follows

V(n-1) = R*Ig

Where Ig is the current in the galvaonemter.

Also

Commonly for a galvaonemter

Ig is given by

Ig = V/R

Hence putting this value of Ig in

V(n-1) = R*Ig we get

R = (n-1) G

Hence, R = (n-1) G is the correct answer.

Answer 2

Explanation:

see the attachment...hope this will help u