What Is Displacement Current?

Displacement current is a time-varying electric field that produces a magnetic field, contributing to electromagnetic waves and Maxwell's equations.

ANSWER : Displacement current is a concept in electromagnetism that helps explain the behavior of electric fields in changing situations. It was introduced by James Clerk Maxwell to complete the equations of electromagnetism.

When an electric field changes with time, it induces a magnetic field, which we already know from Faraday's law. However, Maxwell discovered that even in regions without any actual flow of charges, there is an additional current-like effect called displacement current. It's like a "pretend" current that flows through the electric field, even though there are no actual charges flowing. He called it Displacement Current.

Displacement current is called so because it arises from the displacement or movement of electric charges within a region, even though there may not be any physical charges actually flowing through that region. 

Mathematically, the equation for displacement current is given by :

\(\frac{{\partial D}}{{\partial t}} = \epsilon_0 \frac{{\partial E}}{{\partial t}}\)

Where:

~ \(\frac{{\partial D}}{{\partial t}}\) is the displacement current density.

~ \(\frac{{\partial E}}{{\partial t}}\) is the rate of change of the electric field.

~ \(\epsilon_0\) is the permittivity of free space.

This concept is crucial for understanding how electromagnetic waves propagate and helps explain phenomena like radio waves, light, and the behavior of capacitors.

Also Read : Write the value of classical radius of electron.

Also Read : Define Areal Velocity.

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