Electromagnetism

A current in a wire produces a __________ field around the wire.
An arrangement of wire wrapped around a core is called ______________ '
1. a motor
2. a battery
3. an electromagnet
4. a field
An electromagnet is called a ______________ magnet.
1. temporary
2. permanent
Check the ways to increase the strength of an electromagnet:
1. Use a larger energy source (battery)
2. Use a paper core
3. Use more coils
4. Use an iron core
5. Use thinner wire
If you open the circuit and turn off the curent in an electromagnet, the magnetic field still remains.
1. True
2. False
You have an arrangement that allows you to turn a magnet around a loop of wire, which produces a current in the wire. We call this arrangement a _______.
You have an arrangement of a coil of wire with current flowing in it (an electromagnet). The coil is turning within a permanent magnet. We call this arrangement a ____________ .
A deivice that produces motion energy from electrical energy is a ________ .
1. motor
2. generator
You have two electromagnets that are the same except one has 10 coils and one has 15 coils. Which one will pick up more paper clips?
1. the 10 coil electromagnet
2. the 15 coil electromagnet
Magnets and electric charges both
1. have force fields
2. have postive poles
3. have opposites that repel
A device that produces electrical energy from motion energy is a ___________.