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# Physics Coursework - Factors that affect the resistance of brine-soaked paper

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Introduction

Physics Coursework – Factors that affect the resistance of brine-soaked paper

AIM

I am trying to find out how different factors affect the resistance of brine-soaked paper. I will choose one factor and then do a series of experiments to try to find out how this factor affects the resistance. I have chosen to change the length of the paper.

PREDICTION

I think that when I increase the length of the paper, the resistance will also increase. When I increase the length, I predict that the resistance will also increase by the same amount making the relationship directly proportional.

This is what I think the graph of final results will look like:

I think this will happen because the resistance will drop when the length of the paper is reduced. This is because the ions have a shorter distance to travel through the liquid on the paper when it is a short piece of brine-soaked paper and therefore have less time and less in the paper to collide with the anything.

Middle

RESULTS 2

 Length of Paper (cm) Voltage (V) Current (mA) Resistance(k) 1 1 5.02 7.40 0.68 2 5.02 3.92 1.28 3 5.02 3.25 1.54 4 5.01 2.64 1.90 2 1 5.02 7.33 0.68 2 5.01 3.87 1.29 3 5.01 2.71 1.85 4 5.02 2.25 2.23 3 1 5.01 7.37 0.68 2 5.02 4.13 1.22 3 5.02 3.43 1.46 4 5.00 2.40 2.08 Average! 1 5.02 5.66 0.68 2 5.02 4.06 1.26 3 5.02 3.13 1.62 4 5.01 2.43 2.07

CONCLUSION 2

From these other sets of results I can now see that the same thing is happening again and now I will pull all the results together and put them into a results table then make a graph showing all the results on one graph and see whether

Conclusion

We did not have any odd results. A few of them were spread apart slightly for example 3cm the highest and lowest had a difference of 0.72mA but the resistance worked them out to be more similar and the average was not strayed away from the line of best fit.

I am more certain that my conclusions are correct because we made sure that our experiments were fair each time and I looked and analysed my results and graphs before making my conclusions. Any experiment that I thought needed to be re-done or added. I did which makes me more certain that my conclusions are right.

To find out more about this investigation, I would do a lot more experiments using longer lengths too and I would do experiments for all the different factors I could have chosen for the concentration, width of paper and voltage.

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