- Which is the best explanation of magnetic force?
Your answer:
Magnetism is a metal’s gravity.
Magnetism is the attraction between like particles.
Magnetism is the force exerted by an electric current.
Magnetism is none of the above.
- A bar magnet has two poles -- a north pole and a south pole. If the bar was cut in half
Your answer:
each half would be either north or south.
each half would have its own north pole and south pole.
each half couldn’t be attracted to the other half.
each half would lose its magnetism.
- The lights of the Aurora Borealis result from
Your answer:
particles from the Sun hitting Earth’s magnetosphere.
static electricity in the troposphere.
lightning storms taking place over the horizon.
rainbows that occur at night.
- Which of these would increase the force of an electromagnet?
Your answer:
increasing the current being passed through the coil
reversing the flow of electricity through the coil
decreasing the number of windings in the coil
None of these increases the force of an electromagnet.
- The Earth's magnetic North Pole changes location over time. What causes this?
Your answer:
changes deep in the Earth's core
the rotation of the Earth
the Moon revolving around the Earth
the Earth revolving around the Sun
- A compass reads the Earth's magnetic field. Does a compass function the same when south of the Earth's equator as when north of the equator?
Your answer:
No, it will point in the opposite direction.
Yes, it will always point to magnetic south.
Yes, it will always point to magnetic north.
None of these answers is correct.
- When a magnet is subjected to heat, its magnetism will
Your answer:
decrease.
stay the same.
reverse polarity.
increase.
- Lodestone has a valued property that has been used for centuries. What is it?
Your answer:
The stone is magnetic.
The stone floats.
The stone is very heavy.
The stone glows in the dark.
- In which of these environments would a compass work normally?
Your answer:
in a lightning storm
in orbit around the Earth
at the magnetic north pole
underwater
- Iron filings reveal this in the magnetic field surrounding a bar magnet.
Your answer:
the lines of the magnetic force
the polarity of the magnet
both 1 and 2
neither 1 nor 2