Describe importance of displacement current.

What is displacement current?

When an ideal capacitor is charged by a d.c. battery,no current flows.However,when an a.c. source is used,the current flows continously.How does one exlain this,based on the concept of displacement current.

The SI unit of displacement current is

How does the concept of displacement current lead to the production of electromagnetic waves?

What is the source of displacement current?

What is vaccine? Describe the importance of vaccination.