Homework Help: physic

Posted by hans on Friday, February 11, 2011 at 5:13am.

The resistance of a copper wire of diameter 10mm and length 2m is 15 Ω. Determine the new resistance if
i) the length is doubled and the diameter halved
ii) the length increases by three fold and the diameter doubled
iii) the length decreases by two fold and the diameter is halved
iv) the length increases by four fold and the diameter is trebled

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