A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be
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Voltage sensitivity $= \frac{\text{Current sensitivity}}{\text{Resistance of galvanometer G}}$
⇒ ⇒ $G = \frac{10}{2} = 5 \Omega$ .
Here $i_g = $ Full scale deflection current $= \frac{150}{10} = 15 \, mA$ .
V = Voltage to be measured = 150 × × 1 = 150 V.
Hence $R = \frac{V}{i_g} - G = \frac{150}{15 \times 10^{-3}} - 5 = 9995 \Omega$ .
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