The Motor Effect

• What is the motor effect?

  The motor effect is the phenomenon where a wire carrying an electric current experiences a force when placed in a magnetic field.
• How can the size of the force generated by the motor effect be calculated?

  By using the equation: Force = Magnetic flux density × Current × Length.
• What rule is used to determine the direction of the force in the motor effect?

  Fleming's left hand rule is used to determine the direction of the force.
• What is produced when a current moves through a wire?

  A magnetic field is produced when a current moves through a wire.
• What happens when a wire carrying an electric current is placed in another magnetic field?

  The wire experiences a force due to the interaction between the magnetic fields.
• What is the equation to calculate the force acting on a wire in a magnetic field?

  • Force (N) = Magnetic flux density (T) × Current (A) × Length (m)
• What are the units for magnetic flux density, current, and length in the force equation?

  Magnetic flux density is in Tesla (T), current is in Amperes (A), and length is in meters (m).
• What condition must be met for the force to be calculated using the given equation?

  The wire must be at right angles to the magnetic field.
• What factors affect the size of the force in the motor effect?

  The size of the force depends on magnetic flux density, current, and length of the conductor.
• How does Fleming's left hand rule help in determining the direction of force?

  • Thumb: Direction of motion (force)
  • First finger: Direction of magnetic field (N to S)
  • Second finger: Direction of conventional current (positive to negative)
• What happens if the conductor is parallel to the magnetic field?

  The conductor will not experience a force if it is parallel to the magnetic field.
• 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.