CHAPTER 20 MAGNETISM

The scientific name for a coil of wire with a current flowing through it is a ________.

The magnetic field around a solenoid is ____________ the magnetic field around a straight wire.

• stronger than

• weaker than

• the same strength as

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NGSS.HS-PS2-5

The magnetic field of a solenoid is strongest inside the coil.

• True

• False

Select the advantages of electromagnets over permanent magnets.

• Can be turned on and off

• Heat up quickly

• Their strength can be altered

• They require electricity

Select the uses of electromagnets.

• Fridge doors

• Scrap yard magnets

• MagLev trains

• Magnetic door locks

• Recycling separators

How can the strength of an electromagnet be increased?

• Increase the number of coils

• Use a DC power supply

• Increase the current

• Use a softer core

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

What effect will the south pole of one magnet have on the south pole of another magnet?

• Repulsive
• Attractive
• Combative
• No effect

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

Tags

NGSS.MS-PS2-3

NGSS.MS-ETS1-2

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

Tags

NGSS.HS-PS2-5