question_answer

Across each of two capacitors of capacitance \[1\mu F,\]a potential difference of 10 V is applied. Then positive plate of one is connected to the negative plate of the other, and negative plate of one is connected to the positive plate of the other. After contact:

A)  charge on each is zero

B)  charge on each is same but non-zero

C)  charge on each is different but non-zero

D)  none of the above

Correct Answer: C

Solution :

 A capacitor is an arrangement which can store sufficient quantity of charge. Suppose on giving a charge q to a conductor the electric potential of the conductor becomes V. Then the capacitance of the conductor is \[C=\frac{q}{V}\] When two capacitors are connected as given, then charge will be redistributed in the ratio of their capacitance, so charge on each capacitor will be different but non-zero.