What Affects the Strength of an Electromagnet? Essay examples

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What Affects the Strength of an Electromagnet?
Aim What is the effect of increasing the current and increasing the number of coils when picking up paper clips?
Definition First of all, an electromagnet has to be defined. An electromagnet can also be called a Solenoid, Which consists of a core of iron and then wire is wrapped round it.
Prediction
I predict that as the current carried in the wire gets stronger, so will the magnetic field surrounding the electromagnet. Therefore, I think that the amount of paper clips picked up will increase as the voltage gets higher until the electromagnet can't pick up any more paper clips. I also predict that the more coils wrapped round the wire creates a bigger magnetic field allowing more paper clips
If there are any paper clips still hanging, take them off and count them and record the results

This experiment was a fair test because:
•     The same box of paper clips was used each time.
•     Only one factor (i.e. the current/the no. of coils) was changed.
•     The core of the electromagnet always had the same surface area.
•     The same equipment was used each time.
•     The paper clips were all made of the same material
The experiment may not have been a completely fair test, as I observed that the iron rod would attract about 1-2 paper clips when the electricity was turned off. This meant that the nail did become slightly magnetised but only by a small amount.
Key Factors which could affect this experiment were:
•     The metal that the core is made of.
•     The accuracy of the amount of electricity being used.
•     If the paper clips in the box are magnetised.
•     If the core stays a permanent magnet after the electricity is turned off.
•     If all the paper clips were made of the same metal.
Results I