Electromagnetism Flashcards
1
Q
Magnetic field around a current carrying wire
A
- Magnetic field is made up of concentric circles (circles which have the same center point)
- Shows that the magnetic field around a wire has no poles
- The further away from the wire, the further apart the circles are: shows the magnetic field is strongest closest to the wire
2
Q
Right hand rule
A
- Thumb shows direction of current
- Fingers show direction of magnetic field
3
Q
How to reverse direction of magnetic field
A
- Reverse direction in which current flows
4
Q
What is a conducting wire?
A
- Any wire that has current flowing through it
5
Q
Magnetic field around a solenoid
A
- To increase the strength of the magnetic field around a wire, we cant coil it up to form a solenoid
- The magnetic field inside a solenoid is strong and uniform (same strength and direction at any point)
- Magnetic field lines are the same as a bar magnet
6
Q
What is a solenoid?
A
- When a wire is looped to form lots of coils in one long piece of wire
- An electromagnet (as it has a North and South pole)
7
Q
How can we increase the strength of an electromagnet?
A
- Increase the current flowing through
- Increase the number of coils by keeping the length the same (coils are more dense)
- Decrease the length while keeping the number of coils the same (coils are more dense)
- Add an iron core (soft magnetic material which will become induced)