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JEE Main20208 Jan 2020Evening ShiftPhysicsCurrent ElectricityActual

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

Options

  1. A10 k Ω
  2. B8.9 k Ω
  3. C7.9 k Ω
  4. D9.9 k Ω

Correct answer

D. 9.9 k Ω

Step-by-step solution

V g = i g R g = 0.1 V V = 10 V R = R g V V g - 1 = 100 × 99 = 9.9 K Ω

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