Coil — Science definition

Wire wound into repeated turns. Current through the turns produces a magnetic field.

Where it is taught

Questions using coil

Problem 1

Use the coil records to ask an investigable question about each changed factor. Then draw a repelling-magnet energy model and contrast the work needed for separating an attractive pair.
Hints

Use the illustrated study titled Field strength and stored energy. Keep the observations, model and conditions separate.

Answer and explanation

At fixed 0.2 A, changing turns from 10 to 20 raises the illustrative lift count 3→5; at fixed 20 turns, current 0.2→0.3 A changes it 5→7. These proxy outcomes support questions and a bounded trend, not a direct calibrated force law. Moving repelling magnets closer requires input work; separating attracting magnets can require input work instead. Energy is associated with the pair’s arrangement and can transfer into later motion.

At fixed 0.2 A, changing turns from 10 to 20 raises the illustrative lift count 3→5; at fixed 20 turns, current 0.2→0.3 A changes it 5→7. These proxy outcomes support questions and a bounded trend, not a direct calibrated force law. Moving repelling magnets closer requires input work; separating attracting magnets can require input work instead. Energy is associated with the pair’s arrangement and can transfer into later motion.

Response criteria

  • Isolate turns/current using the proper records.
  • Distinguish proxy measurement from force.
  • Model potential energy, orientation and work.

Problem 2

Explain how changing current can make a speaker produce sound. Name the coil, fixed magnet, cone and surrounding air.
Answer and explanation

Changing coil current changes the magnetic interaction and force on the coil. The attached cone vibrates and disturbs air, producing sound waves.

Follow the supplied cutaway connections.

Explain a mechanism between each pair of parts.

Response criteria

  • Connect current to magnetic force.
  • Connect coil to cone motion.
  • Connect repeated cone motion to air vibration.

Taught alongside

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