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NEET2013PhysicsCurrent ElectricityActual

The internal resistance of a 2.1 ~V cell which gives a current of 0.2 ~A through a resistance of 10 is

Options

  1. A0.2
  2. B0.5
  3. C0.8
  4. D1.0

Correct answer

B. 0.5

Step-by-step solution

( aligned & I= E R+r & 0.2 (10+r)=2.1 & 10+r= 2.1 2 10 & r=10.5-10=0.5 aligned )

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