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

Find how varying the current in an electrical circuit affects the strength of an electromagnet.

Extracts from this document...

Introduction

Aim

The target of my investigation is to find how varying the current in an electrical circuit affects the strength of an electromagnet.

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.

...read more.

Middle

To become magnetic in the first place, the electrons in the c-core will have to align themselves. In order to do so, they group together in domains. The main implication of these domains is that there is already a high degree of magnetization in ferromagnetic materials within individual domains, but that in the absence of external magnetic fields those domains are randomly oriented. A modest applied magnetic field can cause a larger degree of alignment of the magnetic moments with the external field, giving a large multiplication of the applied field.

In other words, the majority of these domains are usually only partly aligned, and the strength of the magnetic field around the core will increase as the magnetic domains align.

...read more.

Conclusion

Eventually though, I predict that the magnetic field around the core will stop getting stronger, (therefore the electromagnet will stop getting stronger). This happens because all the magnetic domains will be aligned up and the electromagnet will have reached its full potential and can 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 filings attracted to the core will not grow anymore.

image00.png

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

    In conclusion the amount of coils do affect the amount of paperclips picked up. This is shown in the average of the graphs, which is a straight line. This shows us that the number of coils is proportional to the number of paperclips picked.

  2. Investigation to find out what affects the size of a shadow.

    Results Experiment 1 Height from screen (cm) Shadow size (cm) 40 14 35 11.925 30 8.175 25 6.75 20 5.675 15 5.075 10 4.5 5 4.1 Experiment 2 Height from screen (cm) Shadow size (cm) 40 15.25 35 11.25 30 9 25 7.125 20 6.375 15 5.525 10 4.875 5 4.575 Experiment 3 Height from screen (cm)

  1. Investigating a factor affecting the voltage output of a transformer.

    the turns on the secondary coil, increasing the voltage induced, via electromagnetic induction, in a given time. Thus increasing primary voltage increases the secondary voltage. There are a number of reasons why V2 doesn't equal V1: * Not all the magnetic field lines pass from the primary to the secondary coil.

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

    on Cobalt, Nickel or Iron in range. There should be a correlation between the current flowing through the wire and the magnetic field exerted and induced on foreign metal objects. I don't think that as the current doubles, the magnetic force and field size doubles. The strength of lines of flux is related to the number of aligned domains.

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

    are which align with the direction of the magnetic field, therefore increasing the strength. Also increasing the cross-sectional area increases the number of domains which align in the direction of the magnetic field. We will not change the bar of soft iron in our electromagnet.

  2. Investigating the factors affecting the strength of an electromagnet.

    When varying the charge I will add an ammeter to the circuit to enable me to take accurate readings of charge. To actually test the strength of the electromagnet, I will lay it in a pile of paperclips and turn on the electromagnet via the power pack and see how many paperclips the electromagnet has been able to attract.

  1. 'What effects the strength of an electromagnet?'

    For this experiment, the iron rod is needed. A high number of coils provides a stronger solenoid. When current flows through the wires it cerate's a magnetic field, therefore with more current a stronger magnetic field and therefore a stronger electromagnet would be created.

  2. I am going to investigate what affects the strength of an electromagnet.

    0.51 0.50 60 0.55 0.54 0.59 0.56 Analysing Results Our results look as they do since the wires give off magnetic fields. The larger these fields, the more force in the attraction between the spring balance and the electromagnet. To make the field larger, more coils are added to the wire.

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