• 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...

Introduction

Electromagnets Coursework

By Samantha price

What is a electromagnet

Planning

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

(Core)

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.

Middle

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

Use the same end of iron core each time.

Method

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.

0.5=0.05

1=0.06

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.

Conclusion

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. Practice A2 Investigation: Measuring the torsion of wire

    to the same point in the torsion bar and the top of the retort stand. Of course there was some uncertainty in the measurement due to the specimens of wire having varying lengths and uniformity; I adjudged this to be an uncertainty of approximately 5mm, not entirely negligible but still

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

    I think this is because some of the paperclips got tangled together. In the second experiment there was only one anomalous result. I think this is because the metal was already magnetised before from the first experiment.

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

    This will inflict the alignment of domains on the 'Soft-Iron Core'. Consequently, the Soft-Iron Core will become a stronger magnet with a larger magnetic field. This field will be capable of inflicting its magnetism (alignment of domains) on Cobalt, Nickel or Iron in range.

  2. Elastictvy of Copper investigation

    The extension was measured by taking the point at which it started at, and reading from this every time a weight was applied to the wire to see how much it had extended. Strain = Extension Length Analysis of the Stress strain graph, Thick Wire In my Hypothesis it stated

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

    of the magnet and so its permeability as ferromagnetic materials such as iron have large magnetic pereambility. This will be kept constant by using the same wire coiled around the magnet throughout the experiment. 3. Length of Soft Iron The longer the soft iron bar , the more domains there

  2. Investigation into the factors affecting the strength of electromagnets - Planning Experimental Procedures.

    (See diagram 3 below) To ensure a fair test the distance between the iron bar and the paper clips will be kept the same, in this case two centimetres. This will ensure accurate results because the distance will effect how many paper clips are attracted to the iron bar.

  1. Measurement of Young modulus of iron

    * The ruler used to measure the extension should be fixed perpendicular to a massive object. * Use a measuring tape to measure the length of the wire after holding it with a water bucker with a ruler. * The ruler fixed on the water bucker should be placed on the middle of the water bucker for balance.

  2. Physics Coursework, Visit to Holly House

    This pulse causes the protons in the area to absorb the energy that is needed to make them spin once again, but now pointing in a different direction. This part of the process is the 'resonance' in Magnetic Resonance Imaging.

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