A galvanometer with full-scale deflection of 10mA is to be converted to a voltmeter with full-scale deflection of 5V. The resistance of the galvanometer is?

A. 1Ω
B. 2Ω
C. 5Ω
D. 10Ω

Correct Answer:

Option D = 10Ω

Explanation

R = (Vg)/lg = G, where lg = current through galvanometer
R = resistance of the multiplier
G = resistance of the galvanometer
∴ G = (vg-R)/lg 5(1000/10) – 490 = 500 -490 = 10Ω