Faraday's Law Basics

What is electromagnetic induction?

• Electromagnetic induction is the process of generating an electromotive force (emf) or voltage across a conductor by exposing it to a changing magnetic field.

• Electromagnetic induction is the process of generating a static magnetic field across a conductor.

• Electromagnetic induction is the process of generating a gravitational force across a conductor.

• Electromagnetic induction is the process of generating a heat energy across a conductor.

Define magnetic flux.

• Magnetic flux is a measure of the total light intensity passing through a given area.

• Magnetic flux is a measure of the total magnetic field passing through a given area.

• Magnetic flux is a measure of the total electric field passing through a given area.

• Magnetic flux is a measure of the total gravitational field passing through a given area.

Explain Faraday's law of electromagnetic induction.

• Faraday's law states that a change in electric field induces a magnetic force in a wire.

• Faraday's law only applies to stationary magnetic fields.

• Faraday's law does not involve any relationship between magnetic fields and electric currents.

• A change in magnetic field through a loop of wire induces an electromotive force (EMF) in the wire.

What is the formula for induced EMF in a coil?

• ε = dΦ/dt

• ε = ∫Φ dt

• ε = Φ^2

• ε = -dΦ/dt

How does the number of turns in a coil affect the induced EMF?

• The induced EMF remains constant regardless of the number of turns in a coil.

• The induced EMF is not affected by the number of turns in a coil.

• The induced EMF increases with an increase in the number of turns in a coil.

• The induced EMF decreases with an increase in the number of turns in a coil.

Describe Lenz's Law.

• Lenz's Law states that the direction of an induced current in a conductor will be such that it has no effect on the change in magnetic flux that produced it.

• Lenz's Law states that the direction of an induced current in a conductor will be such that it supports the change in magnetic flux that produced it.

• Lenz's Law states that the direction of an induced current in a conductor will be such that it enhances the change in magnetic flux that produced it.

• Lenz's Law states that the direction of an induced current in a conductor will be such that it opposes the change in magnetic flux that produced it.

What is the unit of magnetic flux?

• Weber (Wb)

• Tesla (T)

• Henry (H)

• Joule (J)

How can the direction of induced current be determined?

• Using Newton's Third Law

• Consulting a magic eight ball

• Using Lenz's Law

• Guessing randomly

What is the role of a magnetic field in electromagnetic induction?

• Prevents the flow of current in the conductor

• Creates a resistance in the conductor

• Causes the conductor to heat up

• Induces an electromotive force (emf) in a conductor during changes in magnetic field strength or orientation.

Explain the concept of self-inductance.

• Self-inductance is the property of a resistor to resist the flow of current.

• Self-inductance is the property of a capacitor to store energy in an electric field.

• Self-inductance is the property of a coil or conductor to induce an electromotive force in itself when the current flowing through it changes.

• Self-inductance is the property of a conductor to induce an electromotive force in another conductor when the current flowing through it changes.