Exam 7: Magnetism and Electromagnetism

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

The magnetic term that is equivalent to voltage is ________.

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

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

The opposition)to being magnetized is called permeability

A relay is a device that ________.

Soft iron, copper, and silver make good magnets.

If a basic one-loop, dc generator rotates at 60 revolutions each second, how many times each second does its dc output voltage reach a peak value?

A weber is a unit of ________.

In which one of the following applications is electromagnetism used?

How will two permanent bar magnets react if they are brought close to each other?

The polarity of an induced voltage depends on the ________.

A ________ is a type of electromagnetic device that has a movable iron core called a plunger.

Flux lines are concentrated at the center of a magnet.

The magnetic field around an electromagnet is produced by ________.

Two north magnetic poles attract one another.

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

A solenoid converts electrical energy into mechanical energy.

Faradayʹs law and Lenzʹs law are related in that they deal With:

The permeability of air is ________.