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A moving coil galvanometer has resistance 50Ω and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5kΩ 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

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Correct option (4) 20 V

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