JEE Main 2014 Physics question
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 Ω. The battery terminals are connected to external resistance R. The minimum value of R, so that a current passes through the battery to charge it is:
Answer: (3)
Solution
With the battery clamping the terminal voltage at 200 V, the current drawn from the mains is A, while the external resistance carries
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