The equivalent capacitance of the combination shown in the figure is :

CONCEPT:

Here, we use the concept of capacitance in series and parallel.

When capacitance is in parallel it is written as;

C_p = C₁ + C₂ + ........

The capacitance of the capacitor,

Q = CV

Here, C is the capacitance of the capacitor, Q is the charge and V is the potential applied in the material.

CALCULATION:

In the figure, let us assign points 1, 2, and 3, and at points A and B 

Now, when we apply voltage to the circuit from A to B, the capacitance from point 1 to point 3 is coming out to be zero, therefore its charge will be zero.

The circuit is coming out,

Now, using the capacitor in parallel conditions, we have;

CAB = C + C = 2C 

Hence, Option 3) is the correct answer.