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# Varying the current in an electrical circuit affects the strength of an electromagnet.

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Introduction

As the current is increased in a wire, the strength of the magnetic field becomes greater and therefore more effective. An A.C current would demagnetise the core while a D.C. current would magnetise a core. This is because the D.C. current is direct and therefore all the electrons are arranged in the same order creating a magnetic field. When the current is A.C, the electrons are free to move where they want so there is no magnetic field. When an electromagnet has a current induced in it, it becomes magnetised and the greater the current induced the greater the strength. This is because the microscopic domains within the nail receive a greater current and so the strength and actions of these domains are increased.

Middle

The  c-core that I will be using will be ferromagnetic, meaning that it quickly becomes demagnetised when the current is switched off and that it is very efficient at increasing the strength of the magnetic field created by the current in the wire. It is also known that if there are more coils around the core, the electromagnet is stronger. The type of wire is another factor which will affect an electromagnet’s strength.

## Prediction/Scientific reasoning

I predict that as the current increases, the strength of the electromagnet will also increase. I also suggest that there is a relationship of direct proportion between the two variables. For instance, if the current doubles, the strength of the electromagnet will also double.

This is possible to be demonstrated when analysing the following equation:

Conclusion

an be described as  “saturated”. This behaviour can be demonstrated graphically: the curve displaying the relationship between the two variables (current, strength of electromagnet) will eventually level off, showing that the amount of iron fillings attracted to the core will not grow anymore.

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

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