Magnetic fields

Magnets can interact without touching.

• True
• False

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

Tags

NGSS.MS-PS2-3

A north pole and a south pole will attract.

• True
• False

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

Tags

NGSS.MS-PS2-3

A magnet must always have two poles, even if cut in half, because

• A magnet is made up of tiny magnetic domains that are aligned.

• Each pole divides in half and the magnetic field becomes weaker.

• Magnetic domains are out of alignment.

What causes the magnetic field to form in an electromagnet?

• Electromagnets are only called magnets because electricity is involved.

• The domains of the magnet become aligned

• The magnetic field is absorbed from another magnet

• Electric current flowing in a wire

Permanent magnets are made out of the following materials

• Copper, Chromium, and Cobalt

• Iron, Cobalt, and Silver

• Nickel, Cobalt, and Iron

• Copper, Nickel, and Iron

Tags

NGSS.MS-PS2-3

You can cause a permanent magnet to lose its magnetic field if

• You forcefully vibrate the object, causing its domains to fall out of alignment.

• By rubbing an iron object with a permanent magnet in the same direction repeatedly.

• You freeze the object.

• You connect the north and south poles of two magnets.

Tags

NGSS.MS-PS2-3

Magnetic fields are strongest

• between the poles

• at the north pole

• at the south pole

• at both poles

An electromagnet can be strengthened if

• less coils are added to the iron core

• the iron core is removed

• more current runs through the wire

• a nickel or cobalt iron core is used.