A copper wire has a diameter 0.5 mm and resistivity 1.6 10^-8ohm m.
(i) What will be the length of this wire to make the resistance of 12 Ohm
(ii) How much will be the resistance of another copper wire of same length but half the diameter?
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if the diameter is 0.5 mm then the length of a wire is 12 2.7 m and the new resistance is become one fourth times
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