MHT CET Physics question

A parallel plate capacitor is charged to a potential difference of 50 V. It is discharged through a resistance. After 1 second, the potential difference between plates becomes 40 V. Then

(A)Fraction of stored energy after 1 second is 16/25Correct
(B)Potential difference between the plates after 2 seconds will be 32 VCorrect
(C)Potential difference between the plates after 2 seconds will be 20 V
(D)Fraction of stored energy after 1 second is 4/5

Answer: (A),(B)

Solution

In discharge , so falls by the same factor every second; energy gives a fraction after 1 s, so (a) is

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Question ID VK-075482