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

Find out what kind of effect the strength of an electromagnet has if the number of turns on the coil and the current going through the coil are increased.

Extracts from this document...




Physics Investigation                                                                                            Electromagnets


My aim for this experiment is to find out what kind of effect the strength of an electromagnet has if the number of turns on the coil and the current going through the coil are increased.


Electromagnetic induction is the idea that magnetism can travel from one object to another even though they are insulated.

A greater number of coils in the solenoid around the core will increase the strength of the field produced by that electromagnet. This is because the amount of power given to the solenoid and core is increased so the core receives an increase in power, so the domains become aligned strongly, and more domains become aligned. In addition, with an increase in coils the coils cover a greater surface area of the core. This means the coil covers more domains and therefore more domains are influenced. Each turn has it’s own field so more turns mean more fields.

...read more.




  • Magnet
  • Tripod
  • Bubble wrap
  • Voltmeter
  • 2 leads


I did a preliminary experiment with the same apparatus that I will use in my main experiment. I did a preliminary so I could work out an appropriate method for my main experiment. I also did it to find and effective distance to drop the magnet from and also so I could decide a possible range of how many coils to do the experiment for.

From this experiment I found that my initial idea of having the magnet at 50cm was too difficult to aim. But I found that a more reasonable height was 20cms as this was not a problem at that height.


The apparatus was set up as shown in the diagram. It was then measured 20cms above the coil with 60 turns.

...read more.


My measurements were made as accurate as possible by carrying out all the things as mentioned in fair test and by producing replications of the same experiment. If I were to do the experiment again I would I would carry out an experiment when there were no coils wrapped around it so this can be taken into account in my analysis. I feel that this experiment could be improved by having a digital voltmeter, as it was difficult to read the results exactly to get a more accurate result

...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. Peer reviewed

    Investigating the forces acting on a trolley on a ramp

    5 star(s)

    = 0.15823 (5d.p.) The means that uncertainty of the value of � has less of an impact on the results. This is due to the values being nearly of the same magnitude; Angle of ramp: 10.8 Angle of ramp: 3.3 Value of sin O - � cos O = 0.15823 Value of sin

  2. Peer reviewed

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

    4 star(s)

    7 Turn on the switch and record the new 5 successive readings on the graphical calculator as 'X2 T' and reading on the ammeter 'I2 A' 8 Repeat step 6&7 for another 4 times and correlatively get I3 I4 I5 I6 A for currents and get X3 X4 X5 X6 T for strengths.

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

    * Winding the coils around 'soft' iron core. This increases the strength because if an iron bar is placed inside the coil concentrates the lines of force and makes it stronger. Long coils of wire are called solenoids. When a current flows through their external magnetic field is just like a bar magnets.

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

    I can clearly see that there is a pattern to my results. I can see as the objects height from the screen increases the shadow size clearly increases. I know this to be true because as an object gets closer to a light source more light is blocked out this is because light can only travel in straight lines.

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

    These non-magnetic metals have no domains to be lined up. However, an unmagnetised steel rod can be magnetised by stroking it with a permanent magnet, this pulls the domains into line: When a magnet is broken, the new ends formed at the break will have one set of domain poles

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

    Moreover that when N1 and N2 are equal V1 and V2 should also be equal. I found from my results that while the V1 and V2 are directly proportional up until a certain point (V1=2V) they are certainly not equal due to the inefficiency of the transformer.

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

    One possible method to test it is by making use of the search coil (Fig. 3). The search coil is connected to the Y-plate of C.R.O. with the time base off. It is placed next to onf of the solenoids and rotated until the C.R.O.

  2. To see how the number of coils on an electromagnet affect its strength.

    This means solenoids can be used to make permanent magnets made of steel. So therefore, electromagnets can be made stronger by three factors that affect their strength. They are: a) increasing the number of coils: by increasing the coils, it allows more current to flow through efficiently making the process easier, b)

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