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AP EAMCET2008PhysicsCurrent Electricity

When a battery connected across a resistor of 16 , the voltage across the resistor is 12 ~V . When the same battery is connected across a resistor of 10 , voltage across it is 11 ~V . The internal resistance of the battery in ohm is

Options

  1. A10 7
  2. B20 7
  3. C25 7
  4. D30 7

Correct answer

B. 20 7

Step-by-step solution

array ll Here, & V < E & E=V+I r array For first case E=12+ 12 16 r For second case E=11+ 11 10 r From Eqs. (i) and (ii), aligned 12+ 12 16 r & =11+ 11 10 r r & = 20 7 aligned

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