Electromagnetism

Question 1

What is electromagnetism

Answer 1

where electric currents produce their own magnetic field

Question 1

What 4 examples can we look at

Answer 1

regular wires
solenoids
coils
electromagnets

Question 1

How are field lines represented on a wire

Answer 1

circular field lines with most the closer to the wire (strongest point)

Question 2

What is the right hand grip rule used for

Answer 2

determining the magnetic field direction

Question 3

How is the right hand grip rule used

Answer 3

putting thumb up and cupping hand

thumb relates to current direction
cup of hand shows direction of magnetic field

Question 4

How does a solenoid work

Answer 4

coils of circular wire is made

one side of wire has magnetic field clockwise
other side of wire has magnetic field anti-clockwise

creates a powerful uniform magnetic field straight through middle

outside is like a bar magnet

Question 5

What are benefits of electromagnets

Answer 5

they are only magnetic whilst we keep current flowing through it

Question 6

What is important to remember about magnetic fields in a solenoid

Answer 6

they are strong and uniform

Question 7

When we look at a solenoid from north what direction is current and how can we use the N to know

Answer 7

I runs anti clockwise
draw arrows on each point of the N

Question 8

When we look at a solenoid from south what direction is current and how can we use S to know

Answer 8

I runs clockwise
draw arrows on the start and end of the S (runs clockwise)

Question 9

What are the 4 ways to increase an electromagnets strength

Answer 9

increase current
increase number of coils
decrease length of solenoid (densest solenoids are strongest)
add an iron core to inside( create induced magnet and increase strength)