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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.

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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.

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  • 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.

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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

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