Project 1 — Coil Turns and Magnet Strength

Last updated at July 13, 2026 by

Make coils of 25, 50, 75, and 100 turns. Connect each to the same cell, one by one. Note the deflection of a compass kept in the same place each time. Draw a conclusion about how the number of turns affects the strength of the electromagnet.
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More turns make a stronger electromagnet.

Good Practices

  • Keep the cell and compass position the same each time.
  • Change only the number of turns.
  • Note the deflection for each coil.
  • You will see more turns give more deflection.
  • So more turns mean a stronger magnet.
Increasing the coil turns increases the magnet's strength.
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