Find the equivalent capacitance between A and B:

CONCEPT:

Capacitor:

• The capacitor is a device in which electrical energy can be stored.
  • In a capacitor, two conducting plates are connected parallel to each other and separated by an insulating medium carrying charges of equal magnitudes and opposite signs.
  • The space between the two plates can either be a vacuum or an electric insulator such as glass, paper, air, or a semi-conductor called a dielectric.​

​1. Capacitors in series

• When two or more capacitors are connected one after another such that the same charge gets generated on all of them, then it is called capacitors in series.
• The net capacitance/equivalent capacitance (C) of capacitors in series is given by,

2. Capacitors in parallel

• When the plates of two or more capacitors are connected at the same two points and the potential difference across them is equal, then it is called capacitors in parallel.
• The net capacitance/equivalent capacitance (C) of capacitors in parallel is given by,

CALCULATION:

The given diagram is,

    -----(1)

Figure 1 can be drawn as,

     -----(2)

In figure 2 the equivalent capacitance in the upper and lower branch of AB is given as,

⇒ C1 = 2μF

Figure 2 can be drawn as,

      -----(3)

So the equivalent capacitance between AB is given as,

⇒ C = C₁ + C₁

⇒ C = 2μF + 2μF

⇒ C = 4μF

• Hence, option 1 is correct.