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    Please can you help with the questions that I've circle, I'm stuck!

    Thanks!
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    If it's 0.2x the length, then the resistance is (original R)/0.2. So the resistance decreases by the same factor the length increases.
    That should also help with Q15
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    Have you encountered the expression Resistance = density * length / cross sectional area ?
 
 
 
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Updated: July 13, 2016
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