Question

Maxwell in his famous equations of electromagnetism, introduced the concept of

• A. ac current
• B. displacement current
• C. impedance
• D. reactance

Answer 1

Answer: (B)

displacement current

Maxwell's equations are:

1. $\nabla .E=\rho /ϵ$

2. $\nabla .B=0$

3. $\nabla \times E=-\frac{dB}{dt}$

4. $\nabla \times B={\mu }_{0}J+\frac{1}{c^2}\frac{dE}{dt}$

so, considering the last eqn. written,

$\nabla \times B={\mu }_{0}J$ is the Ampere's eqn.

so, Maxwell modified the Ampere's eqn. and introduced the concept of displacement current.

So, displacement current =$\frac{1}{c^2}\frac{dE}{dt}$
Hence the correct option is $\left(B\right)$