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# 'Investigate the factors which affect the strength of an electromagnet'

Extracts from this document...

Introduction

## Henal Rajendra Patel

CENTRE NUMBER: 14625

CANDIDATE NUMBER: 0127

## ‘Investigate the factors which affect the strength of an electromagnet’

An electromagnet can also be called a solenoid. An electromagnet can consist of just one wire, but usually an electromagnet is made up of wire coiled around a soft ferromagnetic core.

TASK & AIM:An electromagnet can be used to pick up objects. I will choose a factor which will affect the strength of an electromagnet I have made and investigate how it affects the strength of your electromagnet.

THE FACTORS THAT AFFECT THE STRENGTH OF AN ELECTROMAGNET:

• Amount of Current
• Length of the core
• Diameter
• Thickness of the wire used for the coils
• Type of core
• Number of turns on the electromagnet

I will vary the number of turns on the electromagnet as that is the factor I have chosen to study, and I will keep the other factors constant. I feel that the more turns that I have on the electromagnet the more iron filings will be picked up. I chose to investigate this factor because I thought that this factor would give me the most reliable results.

The current I will keep constant at 0.2 amps, the thickness of the wire I have used for the coils will stay the same for both experiments.

The coils of wire will be tied round at the same strength for both experiments.

## Henal Rajendra Patel

CENTRE NUMBER: 14625

CANDIDATE NUMBER: 0127

PREDICTION & SCIENTIFIC KNOWLEDGE:

Middle

## Henal Rajendra Patel

CENTRE NUMBER: 14625

CANDIDATE NUMBER: 0127

RESULT TABLE FOR THE 1ST EXPERIMENT’

NUMBER OF TURNS

MASS OF ELECTROMAGNET BEFORE FIRST EXPERIMENT  (g)

MASS OF ELECTROMAGNET AFTER FIRST EXPERIMENT (g)

### DIFFERENCE IN MASS (g)

50

15.12

15.74

0.62

45

15.12

15.7

0.58

40

15.12

15.64

0.52

35

15.12

15.67

0.55

30

15.12

15.60

0.48

25

15.12

15.47

0.35

20

15.12

15.43

0.31

15

15.12

15.21

0.09

10

15.12

15.19

0.07

RESULT TABLE FOR THE 2nd EXPERIMENT’

NUMBER OF TURNS

MASS OF ELECTROMAGNET BEFORE SECOND EXPERIMENT (g)

MASS OF ELECTROMAGNET AFTER SECOND ELECTROMAGNET (g)

#### DIFFERENCE IN    MASS (g)

50

15.10

15.97

0.87

45

15.10

15.95

0.85

40

15.10

15.75

0.65

35

15.10

15.63

0.53

30

15.10

15.58

0.48

25

15.10

15.47

0.37

20

15.10

15.38

0.28

15

15.10

15.35

0.25

10

15.10

15.33

0.23

Conclusion

Reviewing the method I used I feel that it was suitable, however, I could have improved it by making more accurate measuring for the electromagnet.

If I wanted to make my experiment fairer I think I would repeat the experiment more than once. I could also have made a regular check on the ammeter to check the current was running at 0.2 amps, I think the current passing at different rates caused the anomalous result.

To extend the investigation I could have tried varying how tight the coils of wire are wrapped around the electromagnet or another factor, keeping the current constant, then another variable and comparing the results of varying those others. I could also have tried using paper clips instead of iron filings to see if different results were given.

Overall, I am happy about how my experiment turned out and the results I got.

## Henal Rajendra Patel

CENTRE NUMBER: 14625

CANDIDATE NUMBER: 0127

### BIBLIOGRAPHY

Physics for you                                                Keith Johnson

Physics first                                                George Bethall

David Coppock

CGP GCSE Double award Science Physics

The revision guide

GCSE Physics        Second edition                        Tom Duncan

The Internet:

G C S E BBC revision bite size – www.bbc.co.uk/schools/gcsebitesize/

## Henal Rajendra Patel

CENTRE NUMBER: 14625

CANDIDATE NUMBER: 0127

AVERAGE TABLE

### NUMBER OF TURNS

AVERAGE MASS (g)

50

1.055

45

1.055

40

0.845

35

0.815

30

0.72

25

0.615

20

0.45

15

0.215

10

0.185

This table shows the average mass of both experiments.

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