the motor effect

• What is the motor effect?

  The motor effect is the force experienced by a wire carrying current in a magnetic field.
• How can you calculate the size of the force generated by the motor effect?

  By using the equation: force = magnetic flux density × current × length.
• What does Fleming's left hand rule help determine?

  It helps determine the direction of the force on a current-carrying conductor in a magnetic field.
• What is the equation to calculate the force acting on a wire?

  Force (N) = magnetic flux density (T) × current (A) × length (m).
• What are the conditions for the equation of force to apply?

  The wire must be at right angles to the magnetic field.
• If a wire has a length of $2.5 \text{ m}$, carries a current of $1.5 \text{ A}$, and is in a magnetic flux density of $0.005 \text{ T}$, what is the force acting on the wire?


  The force is $0.019 \text{ N}$.
• What factors affect the size of the force in the motor effect?

  • Magnetic flux density
  • Current
  • Length of the conductor
• How do you use Fleming's left hand rule?

  Point your first finger in the direction of the magnetic field, your second finger in the direction of the current, and your thumb will point in the direction of the force.
• What happens if the conductor is parallel to the magnetic field?

  The conductor will not experience a force.
• What is the direction of motion of the wire if the thumb points upwards in Fleming's left hand rule?

  The direction of motion of the wire is upwards.
• What is the relationship between the magnetic field and the current in the motor effect?

  • The magnetic field interacts with the current in the wire.
  • This interaction produces a force on the wire.
  • The direction and size of the force depend on the strength of the magnetic field, the amount of current, and the length of the wire.