Induced emf, or electromotive force, is the voltage generated in a conductor when it is moved through a magnetic field or when the magnetic field around it changes.
The induced emf can be calculated using Faraday's law of induction, which states that the induced emf is equal to the rate of change of magnetic flux through the conductor.
The magnitude of the induced emf depends on the strength of the magnetic field, the speed at which the conductor is moving, and the angle between the conductor and the magnetic field.
An antenna uses induced emf to convert electromagnetic waves, such as radio waves, into electrical signals that can be transmitted or received.
By measuring the induced emf in an antenna, we can determine the strength and frequency of the electromagnetic waves being transmitted or received. This is crucial in the field of wireless communication and can help improve the design and efficiency of antennas.