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AIIMS2018PhysicsCurrent Electricity

A galvanometer of resistance 100 is converted to a voltmeter of range 10 ~V by connecting a resistance of 10 k . The resistance required to convert the same galvanometer to an ammeter of range 1 ~A is

Options

  1. A0.4
  2. B0.3
  3. C1.2
  4. D0.1

Correct answer

D. 0.1

Step-by-step solution

Here, V=10 ~V , aligned & R=10 k , & G=100 =0.1 k & V=I_g(G+R) ; I_g 1 ~mA aligned aligned & (I-I_g ) S=I_g G & or S= I_g G I-I_g aligned = 1 10⁻³ 100 1-1 10⁻³ =0.1

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