Sorbh Bhushan
I will Clamp up the nail and plug two crocodile clip leads into the Power pack and attach each crocodile clip to a different end of the wire, which is wound around the nail.
I will turn on the power to the required voltage and then put the paper clip up so that they are touching the iron nail.
If there are any paper clips still hanging, I will take them off and put them in the container. What I will need to measure is the flow of the current going through the wires
I will measure the current that come out after the current has passed through variable resistor.
Equipment
- Insulated Wire
- Iron nail
- Ammeter
- Iron filings
- Weighing Balance
- Connecting wires
- Variable resistor
- Paper
SAFETY:
- To keep my experiment safe I have to set the iron filings far from my eyes or mouth.
- I will also make sure there is not any water or bare insulation near any electrical equipment to prevent danger of electrocution.
FAIR TEST:
To keep my experiment fair, I will use the same iron nail through the experiment and the second repeated experiment.
And use the same amount of insulated wire.
Sorbh Bhushan
I will use the same batteries, variable resistor and ammeter throughout both experiments to insure fair results.
I will also keep my experiment fair because I feel that the more fairly I keep it the more accurate my results will be.
PREDICTION & SCIENTIFIC KNOWLEDGE:
I predict that the more current that passes through the wire the greater the electromagnetic pull of the soft-iron core will be. The less turns on the coil, will lead to less iron filings will be attracted to the electromagnet.
When insulated wire is wrapped round an iron nail and the ends of the wire are connected to a battery the nail becomes capable of picking up iron filings. This is called an electromagnet. The nail is magnetised by the current in the wire. If the battery is disconnected then the iron filings will fall off, this is because most of the magnetism has been lost.
The more coils used in the electromagnet, the stronger the magnet is. If there is one coil, and another is added then two coils have twice the strength of one. When there is more current passing, there will be more wire or a more magnetised core.
Result table:
Sorbh Bhushan
Sorbh bhushan
Evaluation
Everything went superbly, there was no outlier because the degree of accuracy involved in the experiment. Also all the result went up in proportion, and i also found a formula which connects number of coils, to the number of Newton’s it was able to pull. Also all the results on a graph were in a very strong positive correlation. There was no outlier visible on the graph either. Also, the experiment was repeated 2 times, and a great degree of accuracy was involved to make sure there was no biases or unfair testing. Every time we tested the same value the result were very similar or even the same, showing that there was no chance of anonymous results. this shows the experiment was very reliable, and that it should be good enough to make a firm conclusion, that as the number of coil increase, so does the magnetism in direct proportion.
CONCLUSION & ANALYSIS:
At the end of my experiments I found that when the number of turns decreased the less iron filings would be picked up. This is due to most of the magnetism being lost. The more coils used in the electromagnet, the stronger the magnet is.
The electric current along the wire creates a magnetic field around wire. The fields are in shape of a series of concentric rings.
A magnetic field is a region where magnetic materials such as iron and steel and also wires carrying currents experience force acting on them.
My results turned out quite fair and reasonable, although in my first experiment I did get one anomalous result.
The prediction I made earlier was correct I did find that fewer turns on the electromagnet would lead to less iron filings being picked up, this is exactly what happened in my experiment. The number of coils around an electromagnet is not proportional to the electromagnetic strength. In my graph it shows that the number of coils are not proportional to the strength of the electromagnet, I found that this happened due to me getting anomalous result in my experiment.
When more coils are in contact with the core, more area of interaction is available, allowing more of the area to be magnetised quicker than if the area is smaller. If there is more area, the magnetic area will become stronger.
