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NEET2010PhysicsCurrent ElectricityActual

A galvanometer has a coil of resistance 100 and gives a full scale deflection for 30 ~mA current. If it is to work as a voltmeter of 30 ~V range, the resistance required to be added will be

Options

  1. A900
  2. B1800
  3. C500
  4. D1000

Correct answer

A. 900

Step-by-step solution

Required resistance R= V i_g -G = 30 30 10⁻³ -100=900

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