Electromagnet Summary

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

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Arrows are close together on a force field when the force is

• stronger

• weaker

• opposite

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The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

• making the wire shorter

• making the wire longer

• making the wire into loops

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An electromagnet is a magnet that

• its strength can be varied and turned on and off

• always has a magnetic field around it

• has very little strength

What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

Permanent Magnets and Electromagnets are similar in which TWO ways?

• it can be turned off and on

• they both have a north and south pole

• they are surrounded by a magnetic field

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Bob made an electromagnet but it was very weak.  How can he make it stronger?

• take away a d-cell

• wrap the wire loosely

• use thicker wire

• use less winds

Which rule explains why you would not use a brass rivet to make an electromagnet?

• opposites poles attract

• only iron and steel can become magnetized

• electricity flows from positive to negative

• metals conduct electricity

How could the strength of an electromagnet be increased?

• by decreasing the amount of current in the electromagnet

• by increasing the number of coils in the wires of the electromagnet

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A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

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NGSS.MS-PS2-3

NGSS.MS-PS2-5