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 :
NEET
Physics
Electromagnetic Waves
2025
NEET 2025
NEET Physics Question (2025) — Solution
Options
- A. zero at all places
- B. constant between the plates and zero outside the plates
- C. non-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates
- D. zero between the plates and non-zero outside
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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