When a capacitor is subjected to a D.C. source it takes a small time interval to get fully charged up. During this small-time interval, there is no passage of charge through the dielectric, yet we use a term - displacement current. This term is used because:
There is a continuous change of electric field between plates and hence electric flux
Displacement current is a concept introduced by Maxwell to account for the changing electric field in a capacitor. When a capacitor is charging, the electric field between its plates changes, causing a change in electric flux. This variation in flux leads to displacement current, even though no actual charge moves through the dielectric.
Thus, the correct answer is (b).
Important Questions from Electromagnetic Waves
In an electromagnetic wave, the ratio of energy densities of electric and magnetic fields is:
What will be the time taken by light to travel 2cm thickness of glass of refractive index 1.5?
Calculate the ratio of the range of a transmitting antenna of height 64 m to the receiving antenna of height 16 m:
A plane electromagnetic wave of frequency 30 MHz travels in free space along the x-direction. At a particular point in space and time, \(\vec{E}\)=6.3j^V/m. The \(\vec{B}\) at this point would be:
Match List - I with List - II
List-I List-II (A) Microwave (I) Radar System for Aircraft Navigation (B) UV Rays (II) To study crystal structure (C) X-Rays (III) Radioactive decay of Nucleus (D) Gamma-Rays (IV) Lasik eye surgery Choose the correct answer from the options given below:
