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In the circuit shown in figure the emf E...

In the circuit shown in figure the emf E of the battery is increased linearly from zero to 28 V in the interval `0 le t le 14 s`.
(a) find the energy gained by the `10 V` cell in the interval `0 le t le 14 s`.
(b) At what time the `10 V` cell begin to charge?

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The correct Answer is:
(a) zero
(b) 7 s
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