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A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4 mA 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

Asked in JEE Main 9th April 1st Shift 2019 · Conversion to ammeter and voltmeter

• (1) 10 V
• (2) 20 V
• (3) 15 V
• (4) 40 V

Step-by-step solution

Why the other options are wrong

• (1) Used 2 mA as full-scale current.
• (3) Used 3 mA; arithmetic slip.
• (4) Used 8 mA, doubling the current.

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