A capacitor is charged upto a potential V_o. It is then connected to a resistance R and a battery of emf E. Two possible graphs of potentials across capacitor vs time are shown.

What is the most reasonable explanation of these graphs?

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The first graph shows what happens when the capacitor has a potential lesser than E potential initially and the second shows what happens when it has a potential greater than E potential initially.

The second graph is the correct qualitative shape for any initial potential, but the first is not possible.

The first graph shows what happens when the capacitor has a potential greater than E potential initially and the second shows what happens when it has a potential lesser than E potential initially.

The first graph is the correct qualitative shape for any initial potential, but the second is not possible.

answer is B.

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Detailed Solution

If the capacitor has greater than E potential initially its potential will decrease and graph is first one. When capacitor has less than E potential initially it will follow the second graph.

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