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What is the best way to build an electric motor ?

Building an electric motor involves several key steps and considerations. Here, I’ll provide a detailed guide on how to construct a simple electric motor, commonly known as a homopolar motor. This type of motor is straightforward and can be assembled with readily available materials. Keep in mind that this is a basic demonstration, and more complex electric motors involve advanced engineering principles.

Materials Needed:

  1. Battery (1.5V AA or AAA battery)
  2. Insulated copper wire
  3. Neodymium magnet
  4. Small piece of sandpaper or emery cloth
  5. Small piece of cardboard
  6. Scissors
  7. Tape


  1. Prepare the Wire: Start by stripping the insulation off both ends of the copper wire. Ensure that the wire is clean and free from any insulating material.
  2. Shape the Wire: Bend the wire into a tight, compact coil. Make sure the coil is small enough to fit between the terminals of the battery.
  3. Prepare the Magnet: Sand one side of the neodymium magnet to remove any coating and make it more conductive. This step helps improve electrical contact between the wire and the magnet.
  4. Attach the Wire to the Battery: Place the coil of wire between the positive and negative terminals of the battery. Ensure good contact between the wire and the battery terminals.
  5. Attach the Magnet: Place the sanded side of the neodymium magnet on the top of the coil. Make sure the magnet is centered over the coil.
  6. Test the Motor: Once the wire and magnet are in place, the motor should start spinning. If it doesn’t, check the connections and ensure there is good contact between the wire and the battery terminals.

How It Works:

  • When the coil is placed between the battery terminals, a current flows through the wire due to the potential difference created by the battery.
  • The current interacts with the magnetic field created by the neodymium magnet, generating a force according to the right-hand rule.
  • This force causes the coil to spin, creating a simple electric motor.


  • Experiment with the number of coil turns and wire thickness to observe how it affects the motor’s performance.
  • Ensure that the wire is tightly wound and positioned accurately to enhance the motor’s efficiency.

While this demonstration provides a basic understanding of electric motor principles, constructing more sophisticated electric motors involves intricate designs, precise engineering, and specialized materials. Professional electric motors found in everyday appliances and industrial machinery are developed using advanced manufacturing processes and technologies.

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