Question

in a circular parallel plate capacitor radius of each plate is 5cm and they are separated by a distance of 2mm calculate the capacitance and the energy stored when it is charged by connecting the battery of 200v ​

Answer 1

Capacitance of the capacitor,

C = (Fsilen knot × area) ÷ distance between the plates

C = (8.854×10^-12×3.14×0.05×0.05) ÷ 0.002

C = 34.76pF

Now, energy

E = ½CV²

E = ½×34.76×10^-12×200×200

E = 34.76 × 2 × 10^-8

E = 6.95×10^-7 J