Class 12 NEET Physics Moving Charges and Magnetism

Here, Resistance of galvanometer, G = 100 Ω
Current for full scale deflection,Ig=30mA=30×10−3A
Range of voltmeter, V = 30 V
To convert the galvanometer into an voltmeter of a given range, a resistance R is connected in series with it as shown in the figure.
From figure,
V=Ig(G+R)
or