Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (HT only) What is meant by the motor effect?
   • 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. What factors affect the size of the forces on the conductor?
   • The factors that affect the size of the Force on the conductor are the current and the strength of the magnetic field.
3. How is magnetic flux density calculated? Include SI units.
   • For a conductor at right angles to a magnetic field and carrying a current: Force = magnetic flux density ? current ? length F = B I l Force, F, in newtons, N magnetic flux density, B, in tesla, T current, I, in amperes, A (amp is acceptable for ampere) length, l, in metres, m