NEET 2019 Model Question Paper 2

Here, Resistance of galvanometer,
G = 100Ω
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. Form figure,
V=Ig(G+R)
or R=

V

Ig

−G=

30

30×10−3

−100Ω=900Ω