17. Using the result of problem 12 and Eq. 30-12, we wish to show that 2 √ 2 µ0 i πa > µ0 i 2 R , or 4 √ 2 πa > 1 R , but to do this we must relate the parameters a and R . If both wires have the same length L then the geometrical relationships 4 a = L and 2 πR = L provide the necessary connection:
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