My partner and I chose to change the amount of coils around the nail, for our experiment.
PREDICTION
I predict that the more coils we add to the electromagnet, the stronger the magnetism will be and therefore the larger amount of paperclips the magnet will be able to suspend. So if you double the amount of coils, than the magnet will pick up double the amount of paperclips.
Here is my predicted graph:
METHOD
We will set-up the apparatus in the appropriate way. We will change between using an iron nail, than vary the current strength, change the number of coils in the electromagnet (apart from these we will change nothing else). We will measure the strength of the electromagnet by telling how much weight it can take. We will change the variably around and than make seven observations on how strong the current is.
We could wear gloves to insulate us from the electricity.
THE RESULTS TABLE
CONCLUSION
The more you increase the amount of coils, the stronger and larger the magnetic field becomes. The graph shows that when you add ten more coils to the iron nail, about ten more paperclips are attracted. So my prediction was right, when you double the amount of coils, than the magnet picks up double the amount of paperclips.
EVALUATION
The experiment was a success. Our aim was to find a factor, which made the electromagnet stronger, and when we changed the number of coils the strength of the magnet changed.
We did get a lot of anomalous results. There was no solid pattern in the results because there were always just a few more or a few less paperclips that were attracted, than were expected.
HAMMAD NAVEED
9B
