Electricity And Magnetism Flashcards
0
Q
What happens when you put two north poles together?
A
They will repel.
1
Q
Give 2 reasons why a circuit may not work.
A
Any 2 from: It is wrongly connected Some materials may be faulty Weak power supply The design is incorrect
2
Q
How can you increase the strength of an electromagnet?
A
Increase the number of coil turns
Increase the voltage/current passing through the coil
3
Q
Name three facts about field lines on a magnetic field.
A
The field lines have arrows on them
The field lines come out of N and go into S
The field lines are more concentrated at the poles.
4
Q
What are three uses of electromagnets?
A
They can be used in: Doorbells Microphones Light switches Cranes to lift heavy metals Speakers Telephones
