Solution:
Capacitance of parallel plate capacitor when medium is air
… (i)
According to second condition,
A' = A, t = d / 2, K = 4
Capacitance,
A parallel plate capacitor having cross-sectional area A and separation d has air in between the plates.
Now, an insulating slab of same area but thickness d / 2 is inserted between the plates as shown in
figure having dielectric constant K(= 4). The ratio of new capacitance to its original capacitance will be
Capacitance of parallel plate capacitor when medium is air
… (i)
According to second condition,
A' = A, t = d / 2, K = 4
Capacitance,