ELECTROMAGNETS Flashcards
1
Q
What is produced when an electrical current flows through a wire?
A
A magnetic field
2
Q
What is the magnetic field created in?
A
circles around the wire
3
Q
Does the magnetic field get weaker when further away from the wire?
A
Yes
4
Q
What happens if you coil a wire in the magnetic field?
A
Coiling the wire concentrated the magnetic field inside the loops.
5
Q
A coil makes a field ________ than for a single loop
A
much stronger
6
Q
What is a simple electromagnet?
A
A simple electromagnet is a coil of insulated wire over an iron core.
7
Q
What are the coils called in a simple electromagnet?
A
solenoid
8
Q
- When on, the core becomes ….
- When off, the core is ….
A
- magnetised
- not magnetised
9
Q
What are some ways to increase the strength of an electromagnet?
A
- Use more coils in the wire
- Increase the current in the wire
- Type of core
10
Q
Will passing a solenoid through a magnet generate current?
A
Yes
