Question

A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:

• A. constant between the plates and zero outside the plates
• B. non-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates
• C. zero between the plates and non-zero outside
• D. zero at all places

Hint:

Displacement current acts as a source of magnetic field just like conduction current. Apply Ampère-Maxwell's law considering the displacement current between the capacitor plates. The magnetic field depends on the distance from the axis and is continuous at the edges of the plates.