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# Investigating the electromagnet using various amount of current.

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Introduction

Investigating the electromagnet using various amount of current.

Prediction: I predict that when I increase the current on the solenoid, this will increase the strength of the magnetism on the solenoid

Apparatus: An electromagnet, power pack, croc clips insulted wire variable resistor, ammeter, an iron bar and a Newton metre.

Scientific Knowledge: When insulated wire is wrapped round an iron core and the ends of the wire are connected to a battery the nail becomes capable of picking up paper clips and attracting a Newton meter. This is called an electromagnet. The iron core is magnetised by the current in the wire. If the battery is disconnected then the paper clips will fall off and the Newton meter will lose its attraction. This is because most of the magnetism has been lost.

The passage of an electric current along a wire creates a magnetic field around the wire. The fields are in the shape of a series of concentric rings. The more coils used in the electromagnet, the stronger the magnet is.

Middle

1.9

0.8

200

2.0

0.85

200

2.0

0.9

200

2.2

0.9.5

200

2nd test

 Current (Amps) Force(newtons) No.of turns 1.7 0.4 200 1.8 0.68 200 1.9 0.75 200 2.0 0.8 200 2.0 0.86 200 2.2 0.92 200

The average found from the 1st and 2nd.

 Current (Amps)

Conclusion

average of the three results. It was a reasonably accurate experiment, and if I repeated it I would get similar results. On my graph I had no anomalous results they all fitted and where plotted properly.

If I wanted to make some improvements to this experiment, I would take the results five times, and to use a computerized Newton meter instead of the spring product one. I also could have tried to keep
the temperature more constant by not leaving the current on between the takings of readings and leaving it to cool. I should also have zeroed the balance before taking each reading.

To extend the investigation I could have tried varying the number of coils, or another factor, keeping the current constant, then another variable and comparing the results of varying those others. I could also have tried using iron filings for an example to see if different results were given.

Bibliography:
Books that I have used for help are: A new and physics by D.Brybant and
D.E.Kershaw also Advanced physics fields, waves and atoms by T.Duncan

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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