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1.6

Minor Versionm

by Madhushree HS

Introduction

An electromagnet is a type of magnet with a magnetic field produced by the flow of electric current. The magnetic field disappears when the current is turned off.

Video Overview

    • Copper wire has sharp and pointed ends. Hence, handle it with care.

  1. Take 100 cm of enamelled (insulated) copper wire and an iron nail. Wind the copper wire around the iron nail in a single direction (either clockwise or anticlockwise). Ensure to leave about 6 cm of the copper wire on both the ends, i.e. before and after the winding, for connecting them  to the cell terminals.
    • Take 100 cm of enamelled (insulated) copper wire and an iron nail.

    • Wind the copper wire around the iron nail in a single direction (either clockwise or anticlockwise).

    • Ensure to leave about 6 cm of the copper wire on both the ends, i.e. before and after the winding, for connecting them to the cell terminals.

  2. Gently, scrape both the free ends of the copper wire using the sandpaper to remove the insulation coating. If sandpaper is not available, then use the scissor blade or a cutter to remove the insulation.
    • Gently, scrape both the free ends of the copper wire using the sandpaper to remove the insulation coating.

    • If sandpaper is not available, then use the scissor blade or a cutter to remove the insulation.

  3. Stretch the cycle tube piece and wrap it across the AA cell, such that it covers both the cell terminals, as shown. Insert the two scraped ends (insulation removed) of the copper wire into the cell  wrapped in the cycle tube piece.
    • Stretch the cycle tube piece and wrap it across the AA cell, such that it covers both the cell terminals, as shown.

    • Insert the two scraped ends (insulation removed) of the copper wire into the cell wrapped in the cycle tube piece.

  4. Your electromagnet is ready. Place the tip of the iron nail close to the iron filings on a sheet of paper. Observe how the electromagnet works. Alternatively, you can use safety pins to check the working of the electromagnet.
    • Your electromagnet is ready.

    • Place the tip of the iron nail close to the iron filings on a sheet of paper. Observe how the electromagnet works.

    • Alternatively, you can use safety pins to check the working of the electromagnet.

    • Iron filings and safety pins are not attracted to the electromagnet -

    • The insulation at the free ends of the copper wire is not neatly scraped.

    • The connection of the copper wire at the terminals of the cell is not proper.

    • It is recommended not to leave the electromagnet connected to the cell for a long time as it will unnecessarily heat, and drain the cell.

  5. Reduce the number of loops or winding  of copper wire around the iron nail and observe its impact on the strength of an electromagnet. Replace 1.5 V cell to 3 V cell and observe its impact on the strength of an electromagnet. Replace the iron nail (metal core) with safety pin.
    • Reduce the number of loops or winding of copper wire around the iron nail and observe its impact on the strength of an electromagnet.

    • Replace 1.5 V cell to 3 V cell and observe its impact on the strength of an electromagnet.

    • Replace the iron nail (metal core) with safety pin.

    • To learn more about the variations, please go to DIY Electromagnet (Variations).

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Raghottam Joshi

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