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JEE Main201911 Jan 2019Evening ShiftPhysicsCurrent ElectricityActual

A galvanometer having a resistance of 20 and 30 division on both sides has figure of merit 0.005 ampere/ division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is:

Options

  1. A100
  2. B120
  3. C80
  4. D125

Correct answer

C. 80

Step-by-step solution

Deflection current = Ig _ =n x k=0.005 30 Where, n = Number of divisions =30 and k =0.005 amp / division array l =15 10⁻²=0.15 v = I _ g [20+ R ] 15=0.15[20+ R ] 100=20+ R R =80 array

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