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

Investigating the factors affecting the strength of an electromagnet.

Extracts from this document...

Introduction

  • Investigating the factors affecting the strength of an electromagnet  
  • Background Knowledge:

The theory of magnetism is the only way to explain the process of magnetising an object. In an unmagnetised piece of iron the domains are pointing in numerous directions, which results in them cancelling each other out.

However, a magnetised piece of iron would have all the magnetic domains pointing in all the same direction. This is due to the north poles being at one end and the south poles at the other end. The domains are actually extremely small atomic magnets that line up with each other to form groups, called domains. All iron and steel are made up out of millions of these domains.

The magnetic field is the area around a magnet where it has a magnetic effect. The shape of a magnetic field can be determined by placing a thin layer of iron filings over paper with a bar magnet underneath. When the paper is gently tapped the iron filings act like tiny compasses and point themselves along the lines of flux. The magnetic field of an electromagnet is the same as a bar magnet and it looks like this:

Electricity has a magnetic effect; a wire carrying a current has a magnetic field round it.

...read more.

Middle

Prediction:

Due to my background knowledge I predict that with the increase in the number of coils, the electromagnet will become stronger. This is because every turn of coil has its own magnetic field. When there are more turns in the same area, the coils magnetic fields overlap and this creates a stronger force.

The increase in current put into the electromagnet will increase its force also. This is because as more power is introduced to each coil, its magnetic field is increased and strengthened, causing the magnetic field to extend its previous limits and be able to attract more paperclips.

  • Results:

...read more.

Conclusion

  • Evaluation:

The experiment I chose in my investigation was a good method to use as it effectively illustrated my prediction and was fairly simple to construct and carry out.

The results were very accurate and I had no anomalies, I think this was because I was very careful in trying to maintain one variable only and keeping all other factors constant by using, for instance, an ammeter to observe the current in a lot of accuracy.

The method may not have been entirely accurate as I am not sure that using paperclips to ascertain the electromagnets strength was the most accurate method, this is because it is hard to attach the paperclips once they have reached a certain length although this could have been because the magnetic field only reached so far. I am not sure how the method could be improved to gain more accurate results although possibly using a different material would be advisable.

Despite these queries I am certain that my results firmly support my conclusion as they match up with my background knowledge, prediction and follow a very clear pattern.

Further work could include varying the core used in constructing the electromagnet; I could investigate what makes the electromagnet stronger and weaker in the form of core material.

Lucy Gould                25th February 2002

Mr Wynne, Physics

...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?

    A coil of wire is often called a solenoid. The direction of the magnetic field can be described using the right hand rule. The right hand rule states that if you make a fist, when you point your right hand thumb in the direction of the electric flow, the rest of your fingers curl in the direction of the magnetic field.

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

    of the copper wire at the start had to be 2m long. I also took some readings which gave a correct pattern of results, therefore I decided to use the same method of doing the actual experiment. The magnetic field around a wire is circular and this field weakens as you move away from the wire as shown below.

  1. Investigation to determine the viscosity of glycerol.

    Therefore weight = (r=radius of sphere; ?=density of sphere; g=gravitational force) Upward Force There are two upward forces acting on the sphere namely the viscous force and the upthrust or the Archimedes Principle sometimes called buoyancy.

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

    This is because as the primary voltage is increased, so the alternating current in the primary coil also increases. This results in the magnetic field lines changing direction more frequently, and so are cut more times in a given time period by the turns on the secondary coil, increasing the voltage induced, via electromagnetic induction, in a given time.

  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. Maglev Trains And The Technology Behind Them (magnetism)

    Permanent magnet based levitation has very low power requirements. Electromagnetic suspension (EMS) is an attractive force levitation system whereby electromagnets on the vehicle interact with and are attracted to ferromagnetic rails on the guideway. The orientation of the magnetic fields in a ferromagnet of the domains is random, giving rise to no net magnetic field.

  1. Einstein's theory of relativity.

    The result in both cases will be the same. From this principle, Einstein reasoned that matter in space distorts or "curves" the frame of reference of space. The result of this curvature is what we experience as gravity. Euclidian or "flat" geometry cannot describe curved space.

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

    How Is A Metal With Magnetic Capabilities Attracted? Disregard of whatever material, magnets cannot attract metal without two sets of magnetic fields. As explained before, 'Unlike Poles Attract'. This is because the lines of force which exeunt from the North Pole are attracted to a South Pole. Therefore, the magnets are attracted.

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