Electromagnetism Flashcards
1
Q
Electric currents produce their own (blank)
A
Magnetic Fields
2
Q
The direction of the magnetic field depends on what?
A
The direction of the current
3
Q
Which rule can we use to find the direction of the magnetic field in a wire which has current flowing through it?
A
Right hand rule. Fingers indicate direction of magnetic field when thumb is in direction of current.
4
Q
How is the magnetic field inside a solenoid described?
A
Strong and uniform
5
Q
How is the magnetic field outside a solenoid described?
A
Like the one around a bar magnetic
6
Q
Why are electromagnets useful?
A
They were only be a magnetic field as long as there is current flowing. This allows us to turn the magnetic field on and off
7
Q
What are the 4 ways we can increase an electromagnet’s strength?
A
- Increase the current that flows through the solenoid
- Increase the number of turns in the solenoid while keeping the length of it the same
- Add an iron core to the inside of the solenoid
