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JEE Main20205 Sep 2020Morning ShiftPhysicsCurrent ElectricityActual

A galvanometer of resistance G is converted into a voltameter of range 0 - 1 V by connecting a resistance R in series with it. The additional resistance that should be connected in series with R 1 to increase the range of the voltmeter to 0 - 2 V will be :

Options

  1. AG
  2. BR 1
  3. CR 1 - G
  4. DR 1 + G

Correct answer

D. R 1 + G

Step-by-step solution

i g R 1 + G = 1 i g R 1 + G + R 2 = 2 1 R 1 + G R 1 + G + R 2 = 2 R 1 + G + R 2 = 2 R 1 + 2 G R 2 = R 1 + G

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