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KCET2009PhysicsCurrent Electricity

A galvanometer of resistance 240 allows only 4 % of the main current after connecting a shunt resistance. The value of the shunt resistance is

Options

  1. A10
  2. B20
  3. C8
  4. D5

Correct answer

A. 10

Step-by-step solution

Given, galvanometer resistance G=240 Shunt resistance S= ? I _ G = 4 100 I From figure voltage through the circuit. ( I - I _ G ) S = I _ G G or (1- 4 I 100 ) S = 4 I 100 240 or S= 4 240 96 =10

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