Magnetism Flashcards
1
Q
True or False: Magnetic lines of flux attract and cross paths
A
False. Magnetic lines of flux repel each other and never cross paths.
2
Q
Basic law of magnetism
A
Like poles repel, unlike poles attract
3
Q
How long do electromagnetic fields retain their magnetism
A
As long as current is flowing. The magnetic field stops once current stops.
4
Q
More coils (turns of wire) =
A
More flux
5
Q
Objects can be demagnetized how?
A
By 1. Striking, or 2. Heating
6
Q
What is faradays law?
A
When the magnetic flux density in a conductor changes, the electromagnetic force will change directly
7
Q
What formula is used to reflex faradays law?
A
E=Blv
8
Q
Current enters source from
A
Positive to negative
9
Q
Current enters a load from
A
Negative to positive
