IB DP Topic 11 Electromagnetic Induction (HL)

Front

What does Faraday's Law state?

Back

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

Front

What is Ampere's Law?

Back

Ampere's Law states that the magnetic field generated by an electric current is proportional to the current and inversely proportional to the distance from the wire.

Front

What does Lenz's Law describe?

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 an increase in magnetic flux affect induced current?

Back

An increase in magnetic flux through a circuit induces a current in a direction that opposes the increase, according to Lenz's Law.

Front

What is the relationship between voltage and magnetic flux in Faraday's Law?

Back

Faraday's Law calculates the induced voltage as the negative rate of change of magnetic flux through a circuit.

Front

What is the formula for calculating induced emf?

Back

The formula for induced emf (ε) is ε = -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 it passes, and it is 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 happens to the voltage in a transformer?

Back

In a transformer, the voltage is stepped up or stepped down based on the ratio of the number of turns in the primary coil to the number of turns in the secondary coil.

Front

What is the principle of electromagnetic induction?

Back

The principle of electromagnetic induction states that a changing magnetic field within a closed loop induces an electromotive force (emf) in the loop.

Front

What is the significance of the negative sign in Faraday's Law?

Back

The negative sign in Faraday's Law indicates the direction of the induced emf and current, which opposes the change in magnetic flux.