To Plan and perform an investigation to show how the strength of magnetism in an electromagnet is affected by the number of coils.

Diagram and apparatus

nail

wire

Ammeter

Power pack

Top pan balance

Iron fillings

Method

. Wrap the wire around the nail 20 times

2. Then connect the wire to the ammeter

3. Then connect the wire to the Power pack

4. Mark a height on the nail where u are going to dip the nail into the iron filings

5. Dip the nail in to the iron filings up to the mark

6. Turn off power pack

7. Take all the iron filing off the nail and put them on the top pan balance

8. Record results and do the experiment again but with 30, 40, 50, 60, 70 and 80 coils.

Safety:

Follow all the lab safety rules.

Wear goggles when handling iron filings.

Variables and Fair Test

Problem

How it will affect our experiment

How we will solve it.

Top pan balances

The top pan balance could e slightly out

Use the same top pan balance

Spilling iron filings

If iron filings are missed or dropped the results wont be accurate

Be careful in carrying nail to top pan balance

Number of coils

If there is less or more coils than there should be then the results would be wrong because the electromagnet would be stronger

Count the coils 2 times

Range

We cannot rely on 1 set of results because of all of theses problems

So I will do the experiment 3 times for each concentration.

Results

Coils

stexperiment

(g)

2ndexperiment

(g)

Average

(g)

20

2.08

2.18

2.13

30

2.65

2.70

2.68

40

4.54

4.48

4.51

50

6.65

6.52

6.59

60

7.27

7.24

7.26

70

8.40

8.34

8.37

80

0.65

0.60

0.63

Conclusion

There was a pattern in our results as the Coils increased the weight of iron filings got bigger at 20 coils the electromagnet was weak and only picked up 2.10 grams of iron fillings. But at 80 coils the electromagnet was Strong and picked up 10.75 grams of iron fillings. This is exactly what I said would happen in my prediction

Analysis

I can see from my graph that although it is true that the higher the number of coils the more iron filling can be picked up this is not exactly true because the graph would be a straight line. At the lower coils 20 coils and 30coils the line has a small gradient, but between 30 and 40 coils the line gets steeper, between 40 and 50 coils the line stay at the same gradient, between 50 and 60 coils the line Flattens out, between 60 and 70 coils the line flattens out again to the same gradient as between 50 and 60 coils. Between 70 and 80 coils the line it at its steepest.

Evaluation

Our experiment when quite well we ended up with some good results, this is because we used the same amount Equipment and tried not to spill and iron fillings we had one result that was not accurate at 20 coils on the second experiment this may be because we put the nail in the filings to far, also the reading on the ammeter was flicking up and down slightly so this could have affected all my results. . I could have improved my experiment by making sure we done all the experiments in 1 day and with the same equipment and ammeter.