Electromagnets Basics
IGCSE Edexcel Physics
6.8-6.14 Electromagnetism
Key Concepts:
A current produces a magnetic field. The field around a solenoid is like a bar magnet.
Section A: Fields from Currents
1. Describe the magnetic field around a straight current-carrying wire.
[2]
2. Describe the magnetic field inside a solenoid.
[2]
Section B: Motor Effect
3. Explain why a force acts on a current-carrying wire in a magnetic field.
[2]
4. Use Fleming's left-hand rule to state how to find force direction.
[2]
Total marks: 8
Mark Scheme
1.
Field is circular around the wire [2]
2.
Nearly uniform field, like inside a bar magnet [2]
3.
Magnetic field interacts with current to produce a force [2]
4.
Thumb = force, first finger = field, second finger = current [2]