Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5

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

Extracts from this essay...

Introduction

How Does The Number of Coils On An Electromagnet Affect Its Strength? Aim: To find out how the number of coils on an electromagnet affects its strength. Scientific Knowledge: An electromagnet is a temporary magnet; the magnetic field only exists when an electric current is flowing. Any electric current produces a magnetic field, but the field near an ordinary straight conductor is rarely strong enough to be of practical use. A strong field can be produced if a wire is wrapped around a soft iron core and a current is passed through the wire. The strength of the electromagnet depends on how many coils you wrap round and how high the voltage is. The area of force (magnetic field) surrounding a bar magnet can be shown by the lines of force as shown below, although these lines are no more real than the lines of latitude and longitude on a map or globe. When opposite poles of a magnet are brought together, the lines of force join up and the magnets pull together. When like poles of a magnet are brought together, the lines of force push away from each other and the magnets repel each other.

Middle

The magnetic field becomes stronger because the magnetic field around a wire is circular and vertical to the wire, but the magnet fields from each of the turns in the coil add together, so the total magnetic field is much stronger. The magnetic field around a solenoid is much stronger than a bar magnets because each coil acts like a magnet when a current is passed through it, when the coils are repeated several times it is like having several mini magnets in a row, making it more stronger than bar magnet. Apparatus: Iron Nail Power pack Paper clips Coil wire Wires Crocodile clips Method: 1. Collect all the equipment and paper clips, demagnetise the nail by hitting it with a hammer 2. Connect everything together and put the voltage on the power pack to 4V 3. Wrap the coil around the iron nail 5 times and turn the power supply on 4. See how many paper clips it picks up then turn the power pack off 5. Count how many paperclips it has picked up and record in a table 6. Do experiment several more times, each time winding the coil 5 more times Diagram: Power pack Switch Electromagnet Safety: To make sure that

Conclusion

On the third experiment there were two anomalous results, this is because the magnetism had built up from the two previous results making the third the most inaccurate result. This is mainly due to the fact that the electromagnets had not been demagnetised before each of the experiments. If I could repeat this experiment I would demagnetise the magnet after each time I repeated the experiment, this would give a more accurate result, because I didn't demagnetise the magnet the electromagnet kept increasing its magnetism each time. Also if I could do the experiment again I would do it much more quickly because as the metal heats up it slowly demagnetises the magnet. Another thing that I would change, is that I would change the voltage on the power pack instead of the coils, I would have done this at 1V, 2V and 3V because it would be another way of testing to see if my theory was right, by changing the continuous result. I would also change the way I conducted the experiment, instead of just dipping the paperclips into the pot, I would dangle them off each other. This would give me an accurate reading of how strong the electromagnets field is.

The above preview is unformatted text

Found what you're looking for?

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

Not the one? Search for your essay title...
  • Over 180,000 student essays
  • Every subject and level covered
  • Thousands of essays marked by teachers

Related AS and A Level Fields & Forces

  1. Peer reviewed

    Investigate four factors that may affect the strength for electromagnets: the number of turns, ...

    4 star(s)

    30.7 33.4 32.5 32.5 40 34.5 39.8 36.3 37.2 36.6 50 58.5 63.6 54.3 60.2 61.5 Processed data Number of turns Average Strength of magnet/T 10 6.1 20 17.4 30 31.9 40 39.9 50 59.6 From the graph and the table, I can see that with the number of turns increased, the strength of the magnet increased as well.

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

    This too is a source of energy loss. * At the higher voltages a humming sound was heard. This was caused by the rotation of domains in the iron core. I shall now account for V1 and V2 not being directly proportional as the transformer equation tells us: At larger nominal voltages, e.g.

  1. The aim of this experiment is to investigate what factors affect the strength of ...

    Initially all the different variables involved are identified as constant, dependent or independent. Voltage at 4volts, current 2.69 amps and the resistance at 1.49 ohms are kept constant. The resistance is worked out using a simple equation: Resistance = Voltage/Current or R = V/I Consequently the values of the current and the resistance depend on the voltage.

  2. Einstein's theory of relativity.

    All the effects we associate with gravity would be seen by the observer in the lift. Einstein called the phenomenon shown in this experiment the Principle of Equivalence. This principle states that it makes no difference whether an object is acted on by a gravitational force or is in an accelerated frame of reference.

  1. Investigate the factors affecting the induced e.m.f. in a coil due to the changing ...

    3 Precautions 1. Increase the alternating current gently from zero. Otherwise, the a.c. ammeter would be over-deflected which may cause damage to the ammeter. 2. The ends of PVC covered copper wire should be twisted and kept as far away from the solenoid as possible.

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

    Therefore when the current is increased more domains align in the direction of the solenoid field, increasing the overall magnetic effect .ie. Increasing the strength. I believe that when I do the experiment, proportionally as the current increases, the strength will increase.

  1. The aim of this investigation to see the strength of an electromagnetic by varying ...

    To test this I will wrap a wire around a iron nail for the right amount of coils, and touch the hook of the Newton meter and see how much it can pull the Newton meter down, and record that reading.

  2. The history of Magnets and electromagnets.

    deposits of magnetic ore (magnetite) have been discovered at various places one of these being Labrador. Pieces of this material are called natural magnets because they exhibit the properties of magnetism without any special treatment. The earth is considered to be a huge natural magnet because it possesses the same properties as smaller magnets.

  • Over 180,000 essays
    written by students
  • Annotated by
    experienced teachers
  • Ideas and feedback to write
    your own great essays

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.