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A galvanometer having a coil resistance 100 Ω gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?

Asked in JEE Main 8th Jan 2nd Shift 2020 · Conversion to ammeter and voltmeter

• (1) 8.9 kΩ
• (2) 10 kΩ
• (3) 9.9 kΩ
• (4) 7.9 kΩ

Step-by-step solution

Why the other options are wrong

• (1) Subtracted 1100 Ω instead of 100 Ω.
• (2) Gave the total resistance V/I_g without subtracting G.
• (4) Subtracted 2100 Ω; arithmetic slip.

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