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OK well I've got to work out this question, a copper conductor has a cross sectional area of 1.5mm squared and a resistance of 0.86 ohm, if the resistivity of copper is 17.24 nano ohm. What is the...

so it ends up being r x a / p = L

yeah but I can't work out this transposing stuff. So r/p = L/a, but I still don't know what to do next, do u divide them by a?

But shouldn't it be something like L = blah blah. Without the a being under it, becoz I need that to figure out a question. Where I don't know L

how would I transpose r= PL/a

To make L the subject of the formula

Chur