Question

A galvanometer can withstand safely a maximum current of 5 mA. It is converted into voltmeter
reading upto 20 V by connecting in series an external resistance of 3960 ohm The resistance of galvanometer is​

Answer 1

Answer:

40 Ohms

1. Explanation:

The Voltage drop across both the Galvanometer and Resistor will be V= Ig (G+R)

Ig = Current of Galvanometer, in series so current through both is same

G = Resistance of Galvanometer

R = External Resistance.

Also, remember converting galvanometer to voltmeter connect resistor in series, to convert galvanometer to ammeter connect resistor in parallel.

Answer 2

Explanation:

answer is 40 ohm!!! hope it will help