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JIPMER2004PhysicsCurrent Electricity

When a resistance of 9 is connected at the ends of a battery, its potential difference decreases from 40 V to 30 V. The internal resistance of the battery is

Options

  1. A3
  2. B6
  3. C1.5
  4. D4

Correct answer

A. 3

Step-by-step solution

E=40 ~V , V=30 ~V , R=9 Internal resistance r= ( E V -1 ) R= ( 40 30 -1 ) 9= 1 3 9=3

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