Question

for energy stored in a capacitor, which of the following relation is wrong?
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Answer 1

Answer:

2QV

Explanation:

Let us consider a capacitor of capacitance C and potential difference V between the plates.

Let the charge on one plate be +q and -q on the other.

Suppose the capacitor is being charged gradually.

Now,at any stage the charge on capacitor is q.

Therefore, the potential difference = Cq

Small amount of work doe in giving n additional charge dq to the capacitor is

dW= Cq∗dq

Total work done in giving a charge Q to the capacitor  is

W=∫dW

W= ∫0QCQdq

 W = CQ2

Energy = E= 2CQ2 = 2CV2 = 2QV

Answer 2

Explanation:

the current of 3.2 a is flowing in a conductor the number of electrons flowing per second will be