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First of all, i don't really quite understand with the phrase 'cross section of a bare wire is a square' and I want to know whether the 200 coils involved in calculating the resistance.Does the term 'effective resistance' mean using the formulae of parallel resistor as the wire is wounded one after another side by side,(This is my assumption) ?

Thanks for anybody that spend some time on this question and I really hope that somebody will explain to me the doubt I written above.