Question 358 of 380

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 $5k\Omega$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:

A$40V$B$15V$C$20V$D$10V$

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Answer: (C) $20V$

${V}_{max}=4\times {10}^{-3}\times 50+4\times {10}^{-3}\times 5\times {10}^{3}$
${V}_{max}=20.2V$