Electromagnetism in Use Quick Check
What creates the magnetic force in an electromagnet?
1. coiled wire
2. electric current
3. iron or steel core
4. battery
Which statement about
electromagnets is correct?
1. Two south poles attract each
other.
2. A north pole and a south pole
attract each other.
3. Two north poles attract each
other.
4. A north pole and south pole repel
each other.
Which is the best description of how to build an electromagnet?
1. Wrap a wire around an iron or
steel core at least ten times.
2. Connect one end of a battery to an iron or steel core with a wire, then connect the other end of the battery to the core with another wire.
3. Attach a wire to one end of a battery, wrap the wire around an iron or steel core, and attach the other end of the wire to the other end of the battery.
4. Attach one end of a wire to a battery, and attach the other end of the wire to an iron or steel core.
What causes a maglev train to hover above the track?
1. repellant magnetic force
2. attractive magnetic force
3. electric current
4. massive batteries
1 answer
1 answer