• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Electromagnet Investigation

Extracts from this document...


Electromagnets Coursework

By Samantha price

What is a electromagnet


An electromagnet consists of an iron core with a wire wrapped round it and current

flowing through the wire  

A conductor carrying a current (I) induces a magnetic field.

        This due to the fact that moving charges induces magnetism and the current consists of moving (e )

What are they used for?

Electromagnets are widely used in technology and are the essential components of relays and circuit breakers. Electromagnets are also used in electromagnetic clutches and brakes. In some streetcars, electromagnetic brakes grip directly onto the rails. Very large electromagnets having cores several meters in diameter are used in cyclotrons, and high-power electromagnets are used to lift iron parts or scrap.

This was Found From Encarta

This has helped me so now I see a point in the experiment.  Also people who use the high-powered electromagnet would need to know how to get it high powered.  Keeping in mind current costs money so they may choose to use another way with a lower current.

About Electromagnets


The iron core in an electromagnet is full of magnetic domains, which are randomly pointing anywhere therefore cancelling them out. When an electric current is passed through the coil; this induces a strong magnetic field.

...read more.


Measure the amount of room without the green wire turned on it at each end.

Use the same end of iron core each time.


First I will do a test to see the intervals I should use in the experiment I will see if there is a big enough difference between 0.5 and 1 amps.



I think that the difference between these (0.01) is insignificant and therefore I should do my experiment with 1amp intervals

Gather equipment; green wire, iron core, power pack, circuit ammeter, iron fillings weights that measure to every hundredth of a gram

Turn the green wire around the iron core 15 times then another 15 above.  Leaving 15mm on the right and 50mm on the left end of iron core.

Arrange circuit including electromagnet and ammeter.

When all is set-up without turning the power on see if the electromagnet picks up any iron filings if it does weigh the amount.  If it does this will be because some of the domains are lined up because of another experiment.  

Then put the power up until the ammeter reads 1 amp then place electromagnet in iron filing and measure the mass.

...read more.


Although most of it hasn’t been backed up, “if the current has doubled so will the amount of iron filings that are picked up.”  This is due to the fact the electromagnet became more efficient.

Also this part of my prediction wasn’t backed up, “when the magnetization of the core reaches its saturation level (When all the magnetic domains are turned in the direction of the magnetic field) the increase of current will have little effect on the current.” Even though my results were unable to back this up I still think this will happen if the current was high enough.

Another reason why I would like to increase the current is to be surer about my best-fit line.  As the last 2 results could be anomalies and the best fit line linear.

I think the experiment went well however if I did it again I would:

  1. Make sure residual magnetism wasn’t an issue
  2. Be more firm with variables (for example no iron filings on crocodile clips and no dropping iron filings)
  3. The current was increased so I have a good chance to back up my prediction.

From this experiment I know how companies that use high-powered electromagnet do to make them high powered however I think this is an expensive way so another way may be more appropriate for example amount of turns and surface area of core.

...read more.

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

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Peer reviewed

    paper cones investigation

    5 star(s)

    It would, with care and extra time, be possible to reduce this uncertainty down toward the precision of the electronic balance which is around �0.01g. Drop Distance The uncertainty in the drop distance (�10mm) was mainly due to the hand-release nature of the experiment, variation is likely to be random

  2. Maglev Trains And The Technology Behind Them (magnetism)

    The permeance is bigger for larger cross sections and smaller for long sections of material. Also to find the strength of the Flux density in a straight conductor when can use the Equation F=BIl In this equation F = the force in Newtons on a straight conductor of length l which carries current I.

  1. Einstein's theory of relativity.

    Euclidian or "flat" geometry cannot describe curved space. Thus, Einstein used geometries called Riemannian geometries to describe the effects of gravitation. According to Newton's theory, a planet moves around the sun because of the gravitational force exerted by the sun. According to the theory of general relativity, the planet chooses the shortest possible path throughout the four-dimensional world, which is deformed by the presence of the sun.

  2. What Affects the Strength of Magnetism Exerted By an Electromagnet?

    Therefore, a weak magnet can be formed. Later on, 'Hans Christian Oersted' discovered that electricity has a magnetic effect. A wire carrying a current exerts a magnetic field. We can determine the direction by using the 'Right-hand Grip Rule'. However, we could also determine the direction be looking down on

  1. To investigate the effect of current on the strength of an electromagnet field.

    Copper and iron have different sized ions. The larger the ions the more collisions would occur and the lesser the current would be flowing through and as a result of this varying the strength of the electromagnetic field. Increasing the percentage of iron in the magnet, increases the strength

  2. How does the number of coils on an electromagnet affect its strength?

    Prediction: I predict that as the number of coils are increased the magnetic field will become stronger, because each coil has its own magnetic field, so the more coils there are the more field lines there are which means it would be a stronger electromagnet.

  1. Investigating Electromagnets

    This is because the amount of power given to the solenoid and core is increased so the core receives an increase in power, so the domains become aligned strongly, and more domains become aligned. In addition, with an increase in coils the coils cover a greater surface area of the core.

  2. Physics Coursework, Visit to Holly House

    These magnets produce a 0.5 tesla to 2 tesla magnetic fields, allowing for much higher quality imaging. This is an extremely large number, and the average MRI scanner has a magnetic field that is 10,000 times larger than the magnetic field of the earth.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work