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NEET2011PhysicsCurrent ElectricityActual

A current of 2 A flows through a 2 resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 resistor. The internal resistance of the battery is

Options

  1. A1 / 3
  2. B1 / 4
  3. C1
  4. D0.5

Correct answer

A. 1 / 3

Step-by-step solution

R= E z+r aligned & 2= E 2+r & 0.5= E 9+r aligned From Eqs. (i) and (ii), We have aligned 2 0.5 & = 9+r 2+r 4 & = 9+r 2+r 3 r & =1 r & = 1 3 aligned

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