NGSS.MS-PS2-3

What are two ways to make an electromagnet stronger?

• 1. add more coils of wire around the iron core
  2. wrap a thinner wire around the core
• 1. add less coils of wire around the iron core
  2.add more electricity flowing through a wire
• 1. add more coils of wire around the iron core
  2. add less electricity flowing through the wire
• 1. add more coils of wire around the iron core
  2. add more electricity flowing through the wire

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NGSS.MS-PS2-3

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

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NGSS.MS-PS2-3

If iron filings are sprinkled around the magnet, what will happen? 

• The filings will move away from the magnet's field.
• The filings within the magnetic field will show an attraction between the north and south poles.
• The filings will not create a pattern.
• The filings within the magnetic field will show how the 2 ends of the magnet are repulsive.

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What causes 2 magnets to attract?

• Both poles are north
• They are opposite poles
• Both poles are south
• There are no poles

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An object becomes postiively charged when which of the following occurs?

• loses electrons
• gains electrons
• loses protons
• gains neutrons

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NGSS.MS-PS2-3

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

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NGSS.MS-PS2-3

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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Which change would result in a stronger generator (aka electromagnet)?

• reducing the number of batteries

• increasing the voltage of the battery

• substituting another metal for the iron core

• decreasing the number of coils around the iron core

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NGSS.MS-PS2-3

Will these magnets attract or repel?

• Attract

• Repel

• Neither

• Both

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The best modifications to an electromagnet are..

• Add batteries, less winds

• Add batteries, more winds

• Add batteries, less winds, & thicker wire

• Add batteries, more winds, & thicker wire

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NGSS.MS-PS2-3