Electromagnetism Flashcards
1
Q
What is electromagnetism?
A
The interaction between electricity and magnetism
2
Q
Can magnetic fields be created?
A
Yes, electrical current can create a magnetic field
3
Q
How does current travel?
A
From negative to positive
4
Q
For STRAIGHT WIRE what do fingers/thumbs indicate using the left hand rule?
A
- left thumb: points in the direction of the current
- Fingers: curl in the direction of the magnetic field lines
- Nails: North
- Knuckles: South
5
Q
What are solenoids?
A
Many loops in a solenoid shape creates a dipole shaped magnetic field, similar to that of a bar magnet
Solenoids require a ferromagnetic core
6
Q
For SOLENOIDS what do fingers/thumbs indicate using the left hand rule?
A
- Fingertips: current flow
- Thumb: North
7
Q
What are everyday uses for Solenoids?
A
- Magnetic crane
- Earphones/ speakers/ microphones
- Electric motor
- Electric door bells
8
Q
How do electric doorbells work?
A
Electromagnets attract and release the hammer of the bell
