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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<img alt="\Omega" src="https://entrancecorner.oncodecogs.com/gif.latex?%5COme

 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’(in ohm) , so that a current passes through the battery to charge it is :

 

Option: 1

11


Option: 2

9


Option: 3

7


Option: 4

0


Answers (1)

best_answer

As we discussed in

Determine the internal resistance -

r=(\frac{l_{1}-l_{2}}{l_{2}})R

r=(\frac{E}{V}-1)R

\frac{E}{V}=\frac{l_{1}}{l_{2}}

- wherein

 

 Given E=200V

r=1\Omega

V=220V

\therefore r=(\frac{E-V}{V})R=1=(\frac{20}{220})R

\therefore R=11\Omega

Posted by

shivangi.bhatnagar

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