• 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

    The measurement of the thickness of the wire can be adjudged as being accurate to 3 significant figures as I used a digital micrometer which gave the thickness to 4 significant figures but may have been slightly inaccurate at

  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. The history of Magnets and electromagnets.

    is to place a piece of glass over a bar magnet and then sprinkle iron filings on the glass. The glass offers no opposition to the field, even though it is not a good conductor of magnetic lines. Thus, the filings are affected by the field, and align themselves in a pattern like that of the field around the magnet.

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

    The two factors are proportional to each other because the graph shows a linear relationship. The experiment shows that the electromagnetic field of the solenoid increases as the number of coils are increased. Therefore, more paper clips are picked up.

  1. Electricity and magnetism

    Every magnet has two poles: North and South. Magnetic fields travel from north to south so be careful to label a diagram in this way with an arrow on the line of field pointing towards south. A compass can be used to detect a magnetic field. When electricity passes along a wire, it forms a magnetic field.

  2. Measurement of Young modulus of iron

    * The ruler fixed on the water bucker is used to prevent the tremble of the water bucker for easier observation.

  1. Elastictvy of Copper investigation

    0.5kg 4.90 0.0026 0.000 1.89x1010 0.00 x1012 1.0kg 9.80 0.0026 0.000 3.77 x1010 0.3 x1012 1.5kg 14.70 0.0026 0.001 5.65 x1010 0.6 x1012 2.0kg 19.60 0.0026 0.002 7.54 x1010 1.2 x1012 2.5kg 24.5 0.0026 0.003 9.42 x1010 1.8 x1012 3.0kg 29.40 0.0026 0.005 1.13 x1011 2.7 x1012 3.5kg 34.30

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

    Therefore, the magnets are attracted. Thus, no metal can be attracted by a magnet without its own magnetic field. However, In Magnesia (the origin of the discovery of magnetism), people found that magnets could attract metals which contained Iron, Nickel or Cobalt. The explanation lies with the 'Domain Theory'.

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