The magnetic around a and electromagnets for solenoid has a similar shape particular uses. to that of a bar magnet. Adding an iron core increases the magnetic field strength of a solenoid. An electromagnet is a solenoid with an iron core. 4.6.3.5 (HT only) Explain what is meant 1 WS 1.2 Fleming’s left-hand rule by the motor effect. demonstration When a conductor carrying a Use Fleming’s left-hand rule to current is placed in a Explain why a motor predict the direction of the Make an electric motor magnetic field the magnet spins with respect to on a conductor. (eg available from producing the field and the the magnetic field Winchester Kits) and MS 3c conductor exert a force on produced by a wire investigate how the Apply this equation, which is each other. This is called the carrying an electric speed and direction of given on the equations sheet. motor effect. current and the rotation can be magnetic field of the changed. Questions for students to The direction of the force on permanent magnets in consider (think-pair-share). the conductor is reversed if Predict the direction of the motor interacting. either the direction of the rotation of an electric What is magnetic flux current or the direction of the Recall and use motor when given the density? magnetic field is reversed. Fleming’s left-hand direction of the magnetic What determines magnetic rule. field and the direction of The size of the on the flux density? the current in the coil. conductor depends on: Describe how the size Use animations or and direction of the the magnetic flux density force on a conductor in
The magnetic around a solenoid has a similar shape to that of a bar magnet. Adding an iron core increases the magnetic field strength of a solenoid. An electromagnet is a solenoid with an iron core. and electromagnets for particular uses. 4.6.3.5 (HT only) When a conductor carrying a current is placed in a magnetic field the magnet producing the field and the conductor exert a force on each other. This is called the motor effect. The direction of the force on the conductor is reversed if either the direction of the current or the direction of the magnetic field is reversed. The size of the on the conductor depends on: the magnetic flux density Explain what is meant by the motor effect. Explain why a motor spins with respect to the magnetic field produced by a wire carrying an electric current and the magnetic field of the permanent magnets in the motor interacting. Recall and use Fleming’s left-hand rule. Describe how the size and direction of the force on a conductor in 1 WS 1.2 Use Fleming’s left-hand rule to predict the direction of the on a conductor. MS 3c Apply this equation, which is given on the equations sheet. Questions for students to consider (think-pair-share). What is magnetic flux density? What determines magnetic flux density? Fleming’s left-hand rule demonstration Make an electric motor (eg available from Winchester Kits) and investigate how the speed and direction of rotation can be changed. Predict the direction of rotation of an electric motor when given the direction of the magnetic field and the direction of the current in the coil. Use animations or
AQA-8465-SOW-ISLD.DOCX