Physics · 2014
JEE Main · 9 April 2014, Shift 1 · Q18
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…
A d.c. main supply of e.m.f. $\displaystyle 220$ V is connected across a storage battery of e.m.f. $\displaystyle 200$ V through a resistance of $\displaystyle 1 \Omega$. 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 :
Official answer
(3)
$\displaystyle 11 \Omega$
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.