A d.c. main supply of e.m.f. 220 V is co...

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:

`7 Omega`

`9 Omega`

`11 Omega`

zero

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