Induced emf, or electromagnetic force, is the voltage that is created in a conductor when it is exposed to a changing magnetic field. It is responsible for creating electric currents and can be used in various technologies such as generators and electric motors.
Induced emf can be calculated using Faraday's Law, which states that the induced emf is equal to the rate of change of magnetic flux through a closed circuit. This can be represented by the equation E = -N(dΦ/dt), where E is the induced emf, N is the number of turns in the circuit, and Φ is the magnetic flux.
The magnitude of induced emf is affected by the strength of the magnetic field, the velocity of the conductor, and the angle between the magnetic field and the conductor. It also depends on the length and shape of the conductor, as well as the number of turns in the circuit.
Induced emf and self-inductance are closely related concepts, but there is a slight difference between the two. Induced emf refers to the voltage created in a conductor due to a changing magnetic field, while self-inductance refers to the ability of a circuit to produce its own magnetic field in response to a changing current.
Induced emf has many practical applications, including in generators, electric motors, and transformers. It is also used in wireless charging technology and in electromagnetic induction cooktops. Induced emf is a fundamental principle in many electronic devices and is essential for the functioning of modern technology.