You should be able to:

• Sketch the shape of a magnetic field around a bar magnet.

• Describe how the shape of a magnetic field can be investigated.

• Describe the effect of increasing the current or reversing the direction of a current on the magnetic field around a wire.

• Use the corkscrew rule to determine the direction of the field around a current carrying wire.

• Describe the shape of the field produced by a solenoid. 

Study Resources:

Basics

You should be able to:

• State some uses of electromagnets.

• Describe the structure of an electromagnet in simple terms.

• Describe the operation of simple devices that use electromagnets.

• Investigate the factors that affect the strength of an electromagnet.

Study Resources:

Basics

You should be able to:

• Describe the operation of a moving-coil loudspeaker.

• Apply Fleming’s left-hand rule to determine the direction of the force acting on a conductor.

• Calculate the force acting on a conductor when it is placed in a magnetic field by using the relationship

Force = magnetic flux density x current x length

Study Resources:

Basics

You should be able to:

• Describe electromagnetic induction in a wire.

• Identify the factors that affect the size of an induced current in a wire.

• Identify the direction of current induced in a solenoid.

Study Resources:

Basics

You should be able to:

• Describe the operation of an alternator and microphone in simple terms.

• Describe the operation of a d.c. generator.

• Identify the period and peak output voltage for generators from an oscilloscope trace.

Study Resources:

Basics

You should be able to:

• .

Study Resources:

Basics