Electromagnetic Induction

Flashcards covering key concepts and definitions related to electromagnetic induction.

Electromagnetic Induction

The phenomenon of producing an induced emf across the ends of a conductor when the magnetic flux linked with the conductor changes.

Magnetic Flux (φ)

The number of magnetic lines of force crossing a closed area (A) in a magnetic field (B), defined mathematically as φ = B.A.cosθ.

Induced emf

The electromotive force produced in a closed circuit when there is a change in the magnetic flux linked with that circuit.

Faraday's First Law

Whenever the amount of magnetic flux linked with a closed circuit changes, an emf is induced in the circuit.

Faraday's Second Law

The magnitude of the induced emf is directly proportional to the rate of change of magnetic flux linked with the circuit.

Lenz's Law

The induced current in a circuit flows in a direction that opposes the change or cause that produced it.

Self Induction

The property of a coil that enables it to produce an opposing induced emf in itself when the current in the coil changes.

Coefficient of Self Induction (L)

A constant that defines the proportionality between the magnetic flux linked with a coil and the current passing through it.

Mutual Induction

The phenomenon where a change in magnetic flux linked with one coil induces an emf in a neighboring coil.

Eddy Currents

Induced currents that flow in closed loops within conductors when exposed to changing magnetic fields, causing energy loss due to resistive heating.

AC Generator

A device that converts mechanical energy into electrical energy by rotating a coil in a magnetic field, inducing an alternating current.

Fleming's Right Hand Rule

A rule used to find the direction of induced current in a generator, where the thumb represents motion, the forefinger represents the magnetic field, and the middle finger represents the induced current.

Motional emf

The emf generated due to the motion of a conductor through a magnetic field.

Induced Current

The current that flows in a closed loop due to an induced emf.

Henrys (H)

The unit of inductance, defined as the inductance of a coil in which a change in current of one ampere per second produces an opposing emf of one volt.

Lenz's Law Consequence

Indicates that induced currents always flow in a direction to oppose the change causing them, consistent with the conservation of energy.