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

1. 40 V
2. 10 V
3. 15 V
4. 20 V

Correct answer: 20 V

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