Magnetism 2

In the Figure, starting from the left what magnetic poles are shown on the two bar magnets?

• south, south, north, north
• south, north, south, north
• north, south, north, south
• north, north, south, south

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If you cut a bar magnet in half, each half

• becomes unmagnetized.
• becomes a bar magnet with two poles.
• contains one magnetic pole.
• is only temporarily magnetized.

Tags

NGSS.MS-PS2-3

How can a permanent magnet be demagnetized?

• Cut the magnet in half.
• Strike the magnet with a heavy blow.
• Heat the magnet up.
• both b and c

Which of the following statements describes the interaction between magnetic poles?

• Like poles repel each other, and opposite poles attract each other.
• Like poles attract each other, and opposite poles repel each other.
• Opposite poles repel each other.
• Like poles attract each other.

How does the magnetic force exerted by a magnet change as the distance between two magnets increases?

• The magnetic force increases.
• The magnetic force decreases.
• The magnetic force does not change with distance.
• The magnetic force stays the same.

What are the objects made of that are attracted to the magnet above? 

• Wood
• Metal
• Plastic
• Iron 

Why does a compass needle point in a north-south direction?

• The needle reacts to Earth
  's magnetic poles.
• The needle forms an electromaggnet with Earth's poles
• The needle is lightweitht, so it always spins south.
• The needle is pulled in the middle by Earth's power.

What happens if you break a magnet in two?

• You get two magnets that each have a south pole.
• You will get two magnets that each have a north and south pole
• You will have two magnets that don't have poles.
• You will still have one magnet.

Which of the following are ferromagnetic materials?

• iron
• cobalt
• nickel
• ALL OF THESE

The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.