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Q.

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 1Ω. The battery terminals are connected to an external resistance 'R'. The minimum value of 'R' (in Ω ), so that a current passes through the battery to charge it is:

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answer is 11.00.

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Detailed Solution

Given, emf of cell E=200V​ Internal resistance of cells =1Ω​ D. C. main supply voltage V=220V​ External resistance R=?∴​r=(V−EV)R​⇒1=(20220)×R​⇒R=11Ω
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