Question -
Answer -
Radius of each circular plate, r = 12 cm = 0.12 m
Distancebetween the plates, d = 5 cm =0.05 m
Chargingcurrent, I = 0.15 A
Permittivityof free space, 
= 8.85 × 10−12 C2 N−1 m−2
(a) Capacitance between the two plates isgiven by the relation,
C 
Where,
A =Area of each plate 
Charge on each plate, q = CV
Where,
V =Potential difference across the plates
Differentiationon both sides with respect to time (t)gives:
Therefore, the change inpotential difference between the plates is 1.87 ×109 V/s.
(b) The displacement current across theplates is the same as the conduction current. Hence, the displacement current, id is0.15 A.
(c) Yes
Kirchhoff’sfirst rule is valid at each plate of the capacitor provided that we take thesum of conduction and displacement for current.