← Physics syllabus

SingaporePhysics

Magnetism and Electromagnetism

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How can a changing magnetic field generate a voltage, and how do generators and transformers use this?

Describe electromagnetic induction and explain the a.c. generator and the transformer
A focused answer to the O-Level Physics outcome on electromagnetic induction. Inducing a voltage by a changing magnetic field, factors affecting its size, the a.c. generator, and the transformer with its turns relationship.
8 min answer →

Why does a current-carrying wire in a magnetic field experience a force, and how does a motor use this?

Describe the force on a current-carrying conductor in a magnetic field and explain the d.c. motor
A focused answer to the O-Level Physics outcome on the motor effect. The force on a current-carrying wire in a magnetic field, Fleming's left-hand rule, factors affecting the force, and how the d.c. motor turns.
8 min answer →

What are magnetic poles and fields, and how do magnetic materials behave?

Describe magnetic poles and fields, the laws of magnetic force, and magnetic and non-magnetic materials
A focused answer to the O-Level Physics outcome on magnetism. Magnetic poles, the law of force between poles, magnetic field lines and how to plot them, magnetic versus non-magnetic materials, and magnetic induction.
7 min answer →

How does an electric current produce a magnetic field, and how do we make an electromagnet?

Describe the magnetic field of a current in a wire and a solenoid, and how an electromagnet works
A focused answer to the O-Level Physics outcome on the magnetic effect of a current. The field around a straight wire and a solenoid, the right-hand grip rule, electromagnets, and ways to increase their strength.
7 min answer →