Question

What should be the value of shunt resistance of the ammeter in order to increase its range?

(a) S = (n – 1) G

(b) S = (n – 1)/G

(c) S = \(\frac {G}{(n – 1)}\)

(d) S = \(\frac {G}{(n + 1)}\)

The question was asked during an interview.

I want to ask this question from Moving Coil Galvanometer in division Moving Charges and Magnetism of Physics – Class 12

Answer 1

The correct choice is (c) S = \(\frac {G}{(n – 1)}\)

For explanation I would say: In order to increase the range of an ammeter n times, the value of shunt resistance to be connected in parallel is given by:

S = \(\frac {G}{(n – 1)}\)

In order to increase the range of voltmeter n times, the value of resistance to be connected in series with galvanometer is given by:

R = (n – 1) G