Exam 7: Magnetism and Electromagnetism

Unlike magnetic poles repulse one another.

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

Aluminum, brass, and iron make good magnets.

Magnetic flux is another name for a magnetic field.

Induced voltage resulting from electromagnetic induction is proportional to:

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

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

Faradayʹs law states that the voltage induced across a coil of Wire is proportional to these two factors.

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

The movable part of the solenoid is the:

The movable part of the relay is the:

A solenoid consists of ________.

Magnetic lines that are close to each other are said to have a high ________.

A tesla is a unit of ________.

Like magnetic poles ________.

Unlike magnetic poles ________ and like poles ________.

If some turns of Wire are removed from an electromagnet, the magnetic field Will ________.

The term reluctance in magnetic circuits is like the term ________ in electrical circuits.

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

Applying an ac voltage to an electromagnetʹs coil Will produce a ________.