electromagnetism

The closer to the wire coils the _____ the magnetic field.

• What's a magnetic field?

• Stronger

• Weaker

• Same

a device that uses an electric current to produce motion

• electromagnet

• electric motor

• electric generator

• electromagnetism

a device that uses a magnetic field to transfer mechanical energy to electric energy

• electromagnet

• electric motor

• electric generator

• electromagnetism

a magnet created by wrapping a current-carrying wire around a ferromagnetic core

• electromagnet

• electric motor

• electric generator

• electromagnetism

The strength of an electromagnet can be increased by reducing the number of turns on the wire coil so that more current can flow.

• True

• False

The more loops in a coil of wire around the core of an electromagnet, the stronger the magnetic force.

• True

• False

As a nail approaches the south pole of a magnet, what happens to its magnetic domains?

• The north poles of the domains point toward the magnet.

• The south poles of the domains point toward the magnet.

• The domains spin, but end up in no particular pattern.

• The domains remain unaffected by the magnet.

What makes an electric motor spin?

• The permanent magnet and the electromagnet alternately attract and repel each other.

• The permanent magnet and the electromagnet alternately attract and repel the power source.

• The permanent magnet and the electromagnet continuously repel each other.

• The permanent magnet and the electromagnet continuously attract each other.

How can a wire and a magnet create an electric current?

• (a) The magnet moves inside the coil of wire.

• (b) The coil of wire moves through a magnetic field.

• Neither a nor b will produce an electric current.

• Either a or b will produce an electric current.

 A device that converts electrical energy into kinetic energy

• electromagnet

•  electric motor

• electromagnetic induction

• electromagnetism