Magnetism

Question 0

What is a solenoid?

Answer 0

A coil of wire.

Question 1

How does the right hand grip rule work and when is it used (wire)?

Answer 1

THUMB = Direction of current
FINGERS = Direction of magnetic field lines.
This is used to determine the direction of magnetic field lines around a wire (when a current is passed through it).

Question 2

In a coil of wire does the right hand grip rule apply?

Answer 2

Yes, except the fingers represent the current and the thumb represents the magnetic field lines.

Question 3

To make an electromagnet or magnetic field stronger, we can…

Answer 3

1) Wrap the wire into coils into coils and increase the number of coils.
2) Place it around an iron bar (called the core of the electromagnet).
2a) Use a ‘soft’ iron core.
3) Increase the current.

Question 4

The further away from the coil or wire we get, the magnetic field lines are…

Answer 4

Weaker and further apart. MAKE SURE TO SHOW THIS ON ALL DIAGRAMS IN THE TEST.

Question 5

What are some uses of electromagnets?

Answer 5

Scrapyards, everyday electrical items, trains.