3-ELE-09
Contents
Outcomes
- Pupils can ...
- Pupils can ...
Specification References
6.3 recall the properties of magnetically hard and soft materials
6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field.
6.8 recall that an electric current in a conductor produces a magentic field round it.
6.9 describe the construction of electromagnets
6.10 sketch and recognise magentic field patterns for a straight wire, a flat circular coil and a solenoid when each carrying a current
Starter
Recall from previous lesson 'what is a magentic field?' Demo on OHP using iron filings the shape of the magneic field around:
- a straight wire
- a flat coil
- a solenoid
Students to sketch shapes of magnetic fields for each.
Main Body of Lesson
Practical: To investigate whether placing different materials inside a solenoid will increase the magnetic field strength of the solenoid or not. Students to record observations noting the following:
- must keep the number of turns on the solenoid the same (fair test)
- each bar placed inside the solenoid must be the same size and shape (fair test)
- students can test strength of this 'electromagent' by using it to pick up paper clips or 10 grammes masses (depending on what number of turns are used.