What creates the magnetic force in an electromagnet?(1 point)
Responses
coiled wire
coiled wire
battery
battery
iron or steel core
iron or steel core
electric current
electric current
Which statement about electromagnets is correct?(1 point)
Responses
Two south poles attract each other.
Two south poles attract each other.
A north pole and a south pole attract each other.
A north pole and a south pole attract each other.
Two north poles attract each other.
Two north poles attract each other.
A north pole and south pole repel each other.
A north pole and a south pole attract each other.
Which is the best description of how to build an electromagnet?(1 point)
Responses
Wrap a wire around an iron or steel core at least ten times.
Wrap a wire around an iron or steel core at least ten times.
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.
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.
Attach one end of a wire to a battery, and attach the other end of the wire to an iron or steel core.
Attach one end of a wire to a battery, and attach the other end of the wire to an iron or steel core.
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.
Wrap a wire around an iron or steel core at least ten times.
What causes a maglev train to hover above the track?(1 point)
Responses
attractive magnetic force
attractive magnetic force
repellant magnetic force
repellant magnetic force
electric current
electric current
massive batteries
repellant magnetic force
How does a maglev train move forward?(1 point)
Responses
Magnets in front of the train constantly pull magnets in the train toward them.
Magnets in front of the train constantly pull magnets in the train toward them.
Magnets behind the train constantly push magnets in the train forward.
Magnets behind the train constantly push magnets in the train forward.
The magnets that cause the train to levitate constantly switch on and off.
The magnets that cause the train to levitate constantly switch on and off.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.