Displacement current is an electric current that is created by a changing electric field. It was first proposed by James Clerk Maxwell in his theory of electromagnetism.
Displacement current is a type of electric current that is produced by a changing electric field, while conduction current is the flow of electric charge through a conductive material. Displacement current does not require a physical movement of charges, whereas conduction current does.
Displacement current is included in Maxwell's equations to account for the time-varying electric fields and their effects on magnetic fields. It helps to explain the relationship between electricity and magnetism and is necessary for the equations to accurately describe electromagnetic phenomena.
A galvanometer is a device that can detect and measure small electric currents. To measure displacement current, a galvanometer is connected in series with a capacitor. As the electric field in the capacitor changes, a displacement current is produced, causing a deflection in the galvanometer. The amount of deflection can be used to calculate the strength of the displacement current.
Displacement current has many practical applications, such as in wireless charging, electromagnetic induction, and radio waves. It also plays a crucial role in the functioning of electronic devices such as capacitors, antennas, and transformers.