# 4.7.2.2

4.7.2.2 Fleming’s left-hand rule (HT only)

# 4.1.3 National and global energy resources

## Content

1. 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.
2. Students should be able to show that Fleming’s left-hand rule represents the relative orientation of the force, the current in the conductor and the magnetic field.
3. Students should be able to recall the factors that affect the size of the force on the conductor.
4. For a conductor at right angles to a magnetic field and carrying a current:
5. force = magnetic flux density × current × lengthF=BIl
6. force, F, in newtons, N
7. magnetic flux density, B, in tesla, T
8. current, I, in amperes, A (amp is acceptable for ampere) length, l, in metres, m

MS 3b Change the subject of an equation

MS 3c Substitute numerical values into algebraic equations using appropriate units for physical quantities

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