Chapter 25 Electromagnetic Induction

Question 1

Electromagnetic induction

Answer 1

The induction of voltage when a magnetic field changes with time. If the magnetic field within a closed loop changes in any way, a voltage is induced in the loop:

Voltage induced ~ no. of loops x change in magnetic field/ change in time

This is a statement of Faraday’s law. The induction of voltage is actually the result of a more fundamental phenomenon: the induction of an electric field, as defined for the more general case below.

Question 2

Electromagnetic induction

Answer 2

The induction of voltage when a magnetic field changes with time. If the magnetic field within a closed loop changes in any way, a voltage is induced in the loop:

Voltage induced ~ no. of loops x change in magnetic field/ change in time

This is a statement of Faraday’s law. The induction of voltage is actually the result of a more fundamental phenomenon: the induction of an electric field, as defined for the more general case below.

Question 3

Faraday’s Law

Answer 3

An electric field is created in any region of space in which a magnetic field is changing with time. The magnitude of the induced electric field is proportional to the rate at which magnetic field changes. The direction of the induced field is at right angles to the changing magnetic field.

Question 4

Generator

Answer 4

An electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field. A generator converts mechanical energy to electrical energy.

Question 5

Transformer

Answer 5

A device for transferring electric power from one coil of wire to another, by means of electromagnetic induction, for the purpose of transforming one value of voltage to another.

Question 6

Maxwell’s counterpart to Faraday’s Law

Answer 6

A magnetic field is created in any region of space in which an electric field is changing with time. The magnitude of the induced magnetic field is proportional to the rate at which the electric field changes. The direction of the induced magnetic field is at right angles to the changing electric field.

Question 7

Faraday’s Law

Answer 7

An electric field is created in any region of space in which a magnetic field is changing with time. The magnitude of the induced electric field is proportional to the rate at which magnetic field changes. The direction of the induced field is at right angles to the changing magnetic field.

Question 8

Generator

Answer 8

An electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field. A generator converts mechanical energy to electrical energy.

Question 9

Transformer

Answer 9

A device for transferring electric power from one coil of wire to another, by means of electromagnetic induction, for the purpose of transforming one value of voltage to another.

Question 10

Maxwell’s counterpart to Faraday’s Law

Answer 10

A magnetic field is created in any region of space in which an electric field is changing with time. The magnitude of the induced magnetic field is proportional to the rate at which the electric field changes. The direction of the induced magnetic field is at right angles to the changing electric field.