Resistance of a wire is directly proportional to its
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The resistance of a wire, R ohms (Ω), is directly proportional to its length, l
m, and inversely proportional to the square of its radius, r m.
(a) Make r the subject of the formula.
(b)Given that a wire with a length of 8 m and a radius of 1 cm has a
resistance of 40 Ω, find the value of k.