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 A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of 1\Omega. The battery terminals are connected to an external resistance ‘R’. The minimum value of ‘R’, so that a current passes through the battery to charge it is :

 

  • Option 1)

    7\Omega

  • Option 2)

    9\Omega

  • Option 3)

    11\Omega

  • Option 4)

    zero

 

Answers (2)

best_answer

r=\left ( \frac{\varepsilon -v}{v} \right )R

1=\left ( \frac{20}{220} \right )R 

\Rightarrow R =11\Omega

 


Option 1)

7\Omega

Option 2)

9\Omega

Option 3)

11\Omega

Option 4)

zero

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