The Motor Effect

• What is the motor effect?

  The interaction of magnetic fields causing force
• How do you calculate the size of the force generated by the motor effect?

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

  The direction of the force on the wire
• Who is the target audience for this video lesson?

  High-tier students only
• What happens when a wire carrying current is placed in a magnetic field?

  The wire experiences a force due to interaction
• What is the direction of the force when a wire moves upwards in a magnetic field?

  The force is directed upwards
• What is the equation to calculate the force acting on a wire?

  Force = magnetic flux density × current × length
• If a wire has a length of 2.5 meters, current of 1.5 amperes, and magnetic flux density of 0.05 Tesla, what is the force?

  0.19 Newtons
• What factors affect the size of the force in the motor effect?

  Magnetic flux density, current, and length
• How do you use Fleming's left hand rule?

  Thumb points motion, first finger magnetic field
• What does it mean if a conductor is parallel to the magnetic field?

  It will not experience a force
• What happens to a conductor at right angles to the magnetic field?

  It experiences a force
• What are the steps to apply Fleming's left hand rule?

  • Position thumb, first finger, and second finger at right angles
  • First finger: direction of magnetic field (N to S)
  • Second finger: direction of conventional current (positive to negative)
  • Thumb: direction of motion (force)
• What are the key points about the equation for force in the motor effect?

  • Applies to a wire at right angles to the magnetic field
  • Magnetic flux density measures the strength of the magnetic field
  • Given in the exam, no need to memorize
• What is the significance of the motor effect in physics?

  • Fundamental principle behind electric motors
  • Explains how electric currents interact with magnetic fields
  • Basis for many applications in technology