Magnetism

A compass needle responds to a magnetic field, because the compass needle is a

• A. generator

• B. motor

• C. magnet

• D. transformer

Electric current is measured in ____________.

• Newtons (N)

• Amperes (A)

• Hertz (Hz)

• Volts (V)

A _______________ is a current-carrying coil of wire with lots of loops.

• magnet

• electromagnet

• solenoid

• compass

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

What three minerals are attracted to a magnet?

• Gold, copper, cobalt

• Cobalt, aluminum, silver

• Iron, copper, aluminum

• Iron, nickel, cobalt

What will happen when these magnets are brought close together?

• They will attract each other.
• They will repel each other.
• Both magnets will turn to the left
• Both magnets will turn to the right

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire

What is created when a wire moves between the poles of a magnet?

• A. a ferromagnet
• B. a solenoid
• C. an electromagnet
• D. an electric current

According to the Right Hand Rule, where is the magnetic field generated around a current-carrying wire?

• Perpendicular to the wire
• Parallel to the wire

What can demagnetize a magnet?

• A. high altitudes
• B. high temperatures
• C. low altitudes 
• D. low temperatures