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COMEDK2012PhysicsCurrent Electricity

In a meter bridge a copper coil is connected in the right gap and a resistance of 10 in the left gap. The balance point is obtained at 0.2 ~m . The resistance of the coil is

Options

  1. A40
  2. B5
  3. C20
  4. D2.5

Correct answer

A. 40

Step-by-step solution

Given, P=10 , l=0.2 ~m In balanced condition of meterbridge, P Q = l (1- l ) 10 Q = 0.2 1-0.2 = 0.2 0.8 Q=40

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