Describe the steps of the laboratory work.

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The steps of the laboratory work are:

Assemble an electrical circuit from a power supply, coil, rheostat, and switch, connecting everything in series. Close the circuit and use a compass to determine the magnetic poles of the coil.
Move the compass along the axis of the coil to a distance where the magnetic field effect of the coil on the compass needle is insignificant. Insert an iron core into the coil and observe the effect of the electromagnet on the needle. Draw a conclusion.
Vary the current in the circuit using the rheostat and observe the effect of the electromagnet on the needle. Draw a conclusion.