First slide

Moving coil Galvanometer

Question

A galvanometer coil has a resistance $90 Ω$ and full scale deflection current 10 mA. A $910 Ω$ resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1 V the number of divisions on its scale is

Moderate

A

90
B

91
C

100
D

None

Solution

$\begin{array}{l} R_{V} = \frac{V}{i_{g}} - G \Rightarrow 910 = \frac{V}{10 \times 10^{- 3}} - 90 \\ \Rightarrow V = 10 \Rightarrow No . of division = \frac{10}{0 .1} = 100 \end{array}$

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