Question: Q. 3. In the circuit shown in Figure, initially key K1 is closed and key :

K2 is open. Then K1 is opened and K2 is closed (order is important). [Take Q1 and Q2 as charges on C1 and C2 and V1 and V2 as voltage respectively.]

Then

(a) charge on C1 gets redistributed such that V1=V2

(b) charge on C1 gets redistributed such that Q1=Q2 (c) charge on C1 gets redistributed such that C1V1+ C2V2=C1E

(d) charge on C1 gets redistributed such that Q1+Q2 =Q

[NCERT Exemp. Q. 2.11, Page 12]

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Solution:

Ans. Correct options : (a) and (d)

Explanation: When key k1 is closed and key k2 is open, the capacitor C1 is charged by cell and when k1 is opened and k2 is closed, the charge stored by capacitor C1 gets redistributed between C1 and C2.

So, the charge on C1 gets redistributed such that Q1 +Q2=Q

As C1 and C2 both are in parallel combination, so their potential will be equal, i.e., V1=V2. It verifies the answer (a).



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