Electromagnetic Induction & Force

What is electromagnetic induction?

• The process of generating an emf across a conductor by exposing it to a changing magnetic field.

• The process of converting mechanical energy into electrical energy

• The process of creating a magnetic field around a conductor

• The process of transmitting electricity wirelessly

State Faraday's law of electromagnetic induction.

• The induced emf in a circuit is equal to the rate of change of electric field in the circuit.

• The induced emf in a circuit is directly proportional to the resistance of the circuit.

• The induced emf in a circuit is equal to the negative of the rate of change of magnetic flux through the circuit.

• The induced emf in a circuit is inversely proportional to the number of turns in the coil.

Explain Lenz's law.

• 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.

• 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 has no effect on the change in magnetic flux that produced it.

What is the formula for calculating electromagnetic force?

• F = k * (q1 * q2) / r^2

• F = k * (q1 + q2) / r^2

• F = k * (q1 - q2) / r^2

• F = k * (q1 * q2) * r^2

Describe the factors affecting the magnitude of induced EMF.

• Rate of change of magnetic field strength, number of turns in the coil, area of the coil, orientation of the coil

• Length of the connecting wires

• Temperature of the surroundings

• Color of the coil

How does electromagnetic induction relate to transformers?

• Transformers are not related to electromagnetic induction

• Electromagnetic induction is not used in transformers

• Transformers create electromagnetic induction

• Transformers use electromagnetic induction to transfer electrical energy between circuits.

What is the difference between AC and DC generators?

• The main difference between AC and DC generators is the type of current they produce.

• DC generators are more efficient than AC generators.

• AC generators produce direct current.

• The main difference is the color of the generators.

Discuss the applications of electromagnetic induction in everyday life.

• Generators, transformers, induction cooktops, RFID technology

• Solar panels

• Microwaves

• Bluetooth technology

Explain the concept of self-inductance.

• Self-inductance does not involve electromotive force

• Self-inductance is the property of a coil or conductor by which a change in current flowing through it induces an electromotive force (emf) in the coil itself. This emf opposes the change in current that produced it.

• Self-inductance is the property of a capacitor

• Self-inductance only occurs in parallel circuits

How is electromagnetic induction used in power generation?

• By heating a coil of wire to generate electricity

• By rotating a coil of wire within a magnetic field to induce an electric current according to Faraday's law.

• By shining light on a coil of wire to produce power

• By connecting a coil of wire to a battery to create energy