A material B has twice the specific resistance of 'A'. A circular wire made of 'B' has twice the diameter. of a wire made of A. Then for the two wires to have the same resistance, find the ratio lb/la.
The solution of your fiirst query is provided below
Let (ρA, lA, rA, AA) and (ρB, lB, rB, AB) be specific resistances, lengths, radii and areas of wires A and B, respectively.
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