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Minor Versionm

by Procheta Mallik


A copper coil connected to a battery acts as an electromagnet, which then interacts with a permanent magnet to simulate the functioning of a simple DC Motor

Video Overview

    • Be wary of the sharp/pointy end of the safety pins and the copper wire.

    • Exercise caution when using the paper cutter.

  1. Take 60 cm of insulated (enamelled) copper wire and wind it around the battery.
    • Take 60 cm of insulated (enamelled) copper wire and wind it around the battery.

    • Carefully remove the coil from the battery.

    • Tie knots on both ends to secure the coil.

    • Make sure the loose ends are exactly diametrically opposite, i.e. 9 o'clock and 3 o'clock!

    • Trim off the excess copper wire at the ends so that the length of the coil plus leads is around 1 cm longer than the battery on both sides.

      • The two leads should be of the same length

    • Consider that each lead has a length and a circumference.

      • Use a paper cutter to fully scrape the insulation from one entire lead.

      • The other lead should be scraped on three-quarters of the circumference, but much like the first lead, along its entire length.

    • The lead is scraped entirely.

    • The lead is scraped three sides.

    • Alternatively, you can use scissors or sand paper for scraping off the insulation layer.

    • "Lock" end

    • "Hinge" end

    • Place the safety pin perpendicular to the AA cell so that the "lock" end of the safety pin touches the terminal of the cell and secure it with a tape.

    • Repeat the above step on the other terminal.

    • You may fix a rubber tube piece around the cell to make the connection of the safety pin to terminal more secure.

    • Place two ring magnets on the surface of the battery at the centre.

    • If necessary, use tape to secure the magnets.

    • Insert the ends of the coil through the "hinge" ends of the safety pins so that the coil aligns directly above the magnets.

    • The coil spins as the whole assembly acts now as a simple DC motor.

    • Not enough turns of coil - use a longer copper wire to make the coil.

    • Safety pins are not in contact with the battery terminals.

    • Insulation layer not properly scraped off at the ends of the coil.

    • Use a fresh and potent battery.

    • The ends of coil are not long enough to stay and spin in the safety pins.

    • How many windings are done on the battery?

    • Fill the observation table.

    • Use an external magnet to speed up or slow down the rotation of the coil.

    • Change the shape of the coil, say square or spherical. In case of spherical shape, create a gap between the turns in the same coil and check if coil spins.

    • Make coil using different material like steel binding wire.

    • Use a neodymium magnet in place of ring magnets to make the DC motor.

Finish Line

Attached Documents

Kailash NR

Member since: 05/02/2017

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