Electromagnets

When _______________ travels through a

conductor, a magnetic field is created

• current

• a magnetic field

• neutrons

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

In magnets and electromagnets, similar poles attract

• true

• false

In magnets and electromagnets, dissimilar (opposite) poles attract

• true

• false

The object inside a radio that makes a speaker work is called a(n) ______________________

• electromagnet

• permanent magnet

• electron cloud

In a battery, electrons collect at the __________________ end of the battery.

• positive

• middle

• negative

Electrons which collect at the negative end of the battery, can flow to the positive end through a ___________________

• wire

• electron cloud

• magnet

When the strength of the magnetic field changes, the ________________________between the coil and the permanent magnet changes.

• attractive force

• polarity

• wire

A magnet is defined as

• the force between two opposite poles

• any material that has a magnetic field

• the electron cloud surrounding an object

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil