Electromagnetism

Why does a compass always point north?

• The needle is a magnet and it aligns itself with the Earth's magnetic fields
• Earth is a magnet and it attracts all metal objects towards the north
• Earth's south pole does not have a magnetic pull
• All magnets have a north and south pole 

What would increase the strength of an electromagnet?

• Increasing the amount of current flowing through the wire.
• Inserting a wooden core inside the coil
• Changing the direction of the current
• Decreasing the number of coils of wire

When a bar magnet is broken in half, what is the result?

• Two N poles
• Two S poles
• Two N poles and two S poles
• The bar loses its magnetic properties

Magnetic Field lines....

• Go out of the N side and into the S side
• Go out of the S side and into the N side
• Go out of the N side AND out of the S side
• Go into the N side AND go into the S side

Tags

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A moving magnetic field causes current to flow is called...

• Electromagnetic Induction
• Magnetism
• North Pole
• Generator

Tags

NGSS.HS-PS2-5

A device that converts electrical energy into mechanical energy

• A. electromagnet
• B. electromagnetic induction
• C. electric motor
• D. electromagnetism

What kind of magnet can be turned on and off?

• refrigerator magnet
• electromagnet
• magnetite
• iron

British scientist who discovered that a changing magnetic field can produce an electric current.

• Hans Christian Oersted
• Michael Faraday
• Thomas Edison
• Troy Nasworthy

Tags

NGSS.HS-PS2-5

A tiny region in a magnet where all the atoms are grouped together and their poles are aligned.

• Domain
• North
• South
• Commutator

Spinning electrons themselves are small

• magnets.
• atoms.
• generators.
• joules.

Tags

NGSS.HS-PS2-5

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