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Homopolar Motor Experiment

Prep Time:

15-20 minutes

Cook Time:

  • Handle the neodymium magnet with care to avoid pinching fingers.

  • Be cautious not to short the battery for an extended period as it can get hot.

  • Use pliers for bending the wire to avoid sharp edges.

Serves:

12+ years

Level:

Servings

About the Recipe

  • Understand the basic principles of electromagnetism.

  • Explore how electric current and magnetic fields interact to produce motion.

  • Demonstrate a simple form of motor using everyday materials.

Ingredients

  • 1 AA battery

  • 1 small neodymium magnet

  • Several inches of copper wire (flexible but sturdy)

  • Pliers for bending the wire

Preparation

  • Prepare the Materials: Gather your copper wire, battery, and magnet. Use pliers to strip any insulation from the wire if necessary.

  • Attach the Magnet: Place the neodymium magnet on the negative end of the AA battery. Ensure it sticks firmly.

  • Shape the Wire: Bend the copper wire into a shape that will allow it to touch the positive end of the battery and curve down to hover over or touch the magnet. Common shapes include a simple loop, spiral, or heart.

  • Assemble the Motor: Carefully place one end of the copper wire on the positive terminal of the battery and adjust the other end so it is close to or touching the magnet.

  • Start the Motor: If the wire does not start spinning immediately, gently tap or adjust it until it begins to move. It should continue spinning as long as the circuit is complete.

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