Electromagnetic Induction

Front

What is electromagnetic induction?

Back

Electromagnetic induction is the process by which a changing magnetic field within a closed loop induces an electromotive force (EMF) and consequently an electric current in the loop.

Front

What is Faraday's Law of Electromagnetic Induction?

Back

Faraday's Law states that the induced electromotive force (EMF) in a closed loop is directly proportional to the rate of change of magnetic flux through the loop.

Front

What is Lenz's Law?

Back

Lenz's Law states that the direction of the induced current is such that it opposes the change in magnetic flux that produced it.

Front

How does the speed of a conductor moving through a magnetic field affect induced current?

Back

The faster the conductor moves through the magnetic field, the greater the change in magnetic flux and thus the greater the induced current.

Front

What is the formula for calculating induced voltage (EMF) in a loop?

Back

The induced voltage (EMF) can be calculated using the formula: EMF = -dΦ/dt, where Φ is the magnetic flux.

Front

What is magnetic flux?

Back

Magnetic flux (Φ) is the product of the magnetic field (B) and the area (A) through which the field lines pass, given by the formula: Φ = B * A * cos(θ), where θ is the angle between the magnetic field and the normal to the surface.

Front

What factors affect the magnitude of induced voltage in a loop?

Back

The magnitude of induced voltage is affected by the strength of the magnetic field, the area of the loop, the speed at which the loop moves through the field, and the angle between the magnetic field and the loop.

Front

What is the relationship between resistance, current, and induced voltage in a circuit?

Back

According to Ohm's Law, the current (I) in a circuit is equal to the induced voltage (V) divided by the resistance (R): I = V/R.

Front

What happens to the induced current if the magnetic field is constant?

Back

If the magnetic field is constant and there is no change in magnetic flux, no induced current will flow in the loop.

Front

How does the orientation of a loop in a magnetic field affect induced current?

Back

The orientation of the loop affects the angle θ in the magnetic flux formula; changing the orientation can change the magnetic flux and thus induce current.