When asked how to create an electromagnet the best answer would be what

An electromagnet is a type of magnet that attracts metals with the help of electricity. Professor Hans Christian Oersted coined the term electromagnetism in 1820 and refers to the ability of a cable to carry electrical current to produce a magnetic field.

To create a simple electromagnet you will need:

- 4 inch iron nail.

- 12 gauge magnet copper wire.

- 9-V battery.

- Some iron filings

Wind the copper wire on the nail without overlapping and take out two ends of the wire connecting it to the negative and positive terminal of the battery respectively.

Approach the nail to the iron filing and observe how it is attracted. This is due a conductive wire through which a current flows generates a magnetic field.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: