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question 6 b
R1 = L1/A1 => 12ohms = L1/A1
R2 = L2/A2
L2 = 2*L1 ;. A2 = A1/2
=> R2 = 2(L1)/(A1)/2 = 2*2(L1/A1)
R2 = 4*R1
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