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  4. A moving coil galvanometer has resistance 50Ω and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 kΩ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to :

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Q. A moving coil galvanometer has resistance 50$\Omega$ and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k$\Omega$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to :

JEE MainJEE Main 2019Moving Charges and Magnetism

Solution:

G = 50 $\Omega$
S = 5000 $\Omega$
i$_g$ = 4 × 10$_{-3}$
V = i$_g$ (G + S)
V = 4 × 10${-3}$ (50 + 5000)
= 4 × 10$^{-3}$(5050)
= 20.2 volt
Option (2)