# Determine the potential difference VA–VB between points A and B of circuit shown in fig. under what condition is it equal to zero?

##### 1 Answer

For,

#### Explanation:

Let's calculate the total capacitance of the circuit.

Similarly,

Again,their combination are in parallel,(because potential drop across them is the same)so net capacitance of the circuit is

So,total charge flowing in the circuit is

Now,let,charge flowing through capacitor

So,

and,

Applying Kirchoff's law in the circuit,

or,

putting the value of

If,

then,

Now, either,

Or,

i.e

This is the condition for which