motor effect

• What is the motor effect?

  The interaction of magnetic fields causing force
• How can 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
• What happens when a wire carrying current is placed in a magnetic field?

  The wire experiences a force due to interaction
• What direction does the force act when a wire is placed in a magnetic field?


  Upward direction
• What is the equation to calculate the force acting on a wire?

  Force = magnetic flux density × current × length
• What does the magnetic flux density measure?

  The strength of the magnetic field
• 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 acting on it?

  0.19 Newtons
• What are the three factors that affect the size of the force?

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

  Align thumb, first finger, and second finger at right angles
• In Fleming's left hand rule, what does the first finger represent?

  The direction of the magnetic field
• In Fleming's left hand rule, what does the second finger represent?

  The direction of the conventional current
• What does the thumb represent in Fleming's left hand rule?

  The direction of the motion or force
• What happens if the conductor is parallel to the magnetic field?

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

  It will experience a force
• What is the significance of the motor effect in exams?

  It could be asked in your exam
• What are the steps to calculate the force acting on a wire in a magnetic field?

  1. Identify the magnetic flux density (in Tesla)
  2. Identify the current (in amperes)
  3. Identify the length of the wire (in meters)
  4. Use the formula:

  • Force = magnetic flux density × current × length
• What are the key points of Fleming's left hand rule?

  • Thumb: direction of motion (force)
  • First finger: direction of magnetic field (N to S)
  • Second finger: direction of conventional current (positive to negative)