Exam 7: Series-Parallel Circuits

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

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

A conductor with no current through it will still have a magnetic field around it.

If a higher voltage is needed from a generator, what must be done?

A permanent magnet will retain its magnetism for a long period of time.

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

How does the magnetic field change around a conducting wire if the current increases?

The speed of movement of the coil of a generator affects the direction of current produced.

The voltage produced by a magnetic field cutting through a conductor depends on the ________.

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

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

Magnetic flux is another name for a magnetic field.

If the contacts fail to open when a relay is de-energized, what is the trouble?

A DC generator produces a smooth DC voltage output.

The quantity of lines of force per unit of area is known as ________.

A weber is a unit of ________.

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

The ________ electromagnet cannot be further magnetized.

Aluminum, brass, and iron make good magnets.

If a tape recorderʹs output voltage increases and decreases when you shake the recorder, a possible problem might be ________.