Exam 7: Magnetism and Electromagnetism

Unlike magnetic poles repulse one another.

The principal difference between a solenoid and a relay is that:

A tesla is a unit of .

An ampere -turn is a unit of .

If the number of turns of wire on an electromagnet increases, the magnetomotive force mmf .

Electromagnetic induction is best defined as the process by which a voltage is produced in a conductor when there is:

According to the left -hand rule for the magnetic field around a conductor, what points in the direction of current flow?

The movable part of the solenoid is the:

In which one of the following applications is electromagnetism used?

Faraday's law states that the voltage induced across a coil of wire is proportional to these two factors.

A relay is a device that .

If the cross -sectional area of a magnetic field decreases, the flux density .

The magnetic field around an electromagnet is produced by .

Reversing the current through an electromagnet the magnetic field.

Hysteresis is a characteristic of magnetic materials wherein a change in magnetization:

The left -hand rule can be used to determine the amount of magnetomotive force.

A coil of wire with current flowing through it is called a(n).

For a high current switching application where it is not practical to route heavy wiring to the switch location which device would be used?

Which one of the statements below does NOT apply to the voltage induced into a wire when it is moved through a magnetic field?

If two north magnetic poles are brought close to each other, .