Magnetic field of a coil

Series of experiments related to understanding how electric current is generated

Aim:

Build a coil and see its behavior when a current flows through it.

Material:

• 4 - 5 meters of coil wire (failing that, use electrical wire with the thinnest possible plastic insulation, such as the one used in headphones)
• Plastic reel (reel of electrical tape or adhesive tape)
• Cardboard sheet.
• Iron filings.
• Compass

Process:

Coil Construction

• Wind the conductive thread on the spool, about 300 turns (spirals). - Fix it with zeal or insulating tape giving it a complete turn. - Remove the insulation from the tips. The coil is ready to go.

Coil behaviour:

• Make an H-shaped hole in the cardboard sheet, in such a way that the coil can be inserted with half facing up and the other half below.
• Spread the filings as in the previous activity.
• Give the usual tapping and connect the source.

Record what you observe:

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Next, approach the compass by one of the faces and write down what is observed:

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Place the compass on the other side and write down what is observed:

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Write down what happens if the connections are switched and all the previous steps are repeated:

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