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# Physics investigation- Strength of Electromagnet

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Introduction

Physic investigation- Strength of Electromagnet Aim The aim of the investigation is to find the strength of an electromagnet and how this is affected by an increase in current (I). We already know that other factors that increase the strength are the amount of coils and the inclusion of an iron core. Factors We will control the current using a variable resistor and measure it using an ammeter; we will keep the voltage the same. Keep the distance of the electromagnet from the scales the same. Make sure the magnet that is upon the scales is always in the same position. Also keep the distance of the last coil from the end of the iron core constant. We will have to keep the amount of coils around the iron core the same throughout the experiment and not add or take away an iron core. Hypothesis As the current increases the strength of the magnet increases. This will appear as a proportional line on the graph, but eventually the line will level off and the strength of the magnet will become saturated and the magnet will have found its maximum strength. Why? 'Stephen Pople's co-ordinated science' book supports my hypothesis on pages 152-153, here it mentions that an electromagnet can become saturated after so many coils have been wrap around the iron core. It tells us that an unmagnitised piece of iron has its domains spread out and angled in different directions When you ...read more.

Middle

Analysis Current Test 1 Test 2 Test 3 Grams Kilograms Force (N) *10 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.50 0.5 1.1 1.1 0.9 0.0009 9.00 1.00 1.6 2.5 2.4 2.2 0.0022 22.00 1.50 3.9 4.1 3.8 4.05 0.00405 40.50 2.00 5.2 5.9 5.1 5.4 0.0054 54.00 2.50 6.7 7,4 6.5 6.9 0.0069 69.00 3.00 7.9 10.15 7.8 8.6 0.0086 86.00 3.50 10.4 No result 8.9 9.65 0.00965 96.50 4.00 13.2 No result 10.1 11.6 0.0116 116.00 I found that as I increased the current the strength of the magnet increased. This agrees with my Hypothesis in the way that an increase in current meant that more domains of the atoms were facing in the same direction. Unfortunately 4 amps (our maximum output) and 90 coils wasn't enough to reach a point of saturation. If we did, it would have been shown as a straight flat line on the graph. This then means we could not prove the hypothesis but support it, to prove it we would need to increase the current and have more coils. In our graph we can see what may be the beginning of saturation with the last few results but we didn't have very reliable results for the points from 3.00 to 4.00 amps, more investigation is need to find out where they should be plotted. The final point (4amps) ...read more.

Conclusion

need to investigate the points from 3.00 - 4.00 amps as this is not as we expected but the rest of the results prove part of the hypothesis but not the saturation part Improvements * To stop any chance of the electromagnet attracting the magnet it would be better to change the side of the magnet so that they are repelling and pushing down on the scales and then we would use the formula again to find the force. We know that when a magnet goes near another metal it induces the metal which is why it attracts it, but as we used a magnet for the electromagnet to attract we have to be sure that the magnets same ends are facing each other, other wise they won't repel each other. * Investigate the 3.00 - 4.00 amps part * Repeat the test to give a fairer average * Use more coils to help try and find a saturation point 150 would be sufficient * Use a second Iron core I would do the experiment again with the improvements so that we would see a point of saturation. Adjusting the current using a variable resistor and ammeter in steps of 0.5 amps from 0 - 4. With the increase in coils the strength of the magnet would have increased so 4 amps should be enough to see the domains of the magnet become saturated. ?? ?? ?? ?? Greg Lewis 10 SD Page 1 ...read more.

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