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NEET2025PhysicsElectromagnetic WavesActual

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 :

Options

  1. Azero at all places
  2. Bconstant between the plates and zero outside the plates
  3. Cnon-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates
  4. Dzero between the plates and non-zero outside

Correct answer

C. non-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates

Step-by-step solution

aligned & I_d= ₀ d _e d t = ₀ d d t (E A 0^ ) & I_d= ₀ A d E d t & E= ₀ ; I_d= ₀ A d d t ( ₀ ) & I_d=A ( d d t )= constant aligned Also B due to I_d is max ^m at surface of imaginary cylinder

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