(a) Differentiate between electrical resistance and resistivity of a conductor.
(b) Two metallic rods, each of length L, area of cross section A1 and A2, having resistivity p1 and p2 are
connected in parallel across a d,c battery. Obtain the expression for the effective resistivity of this
combination
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Explanation:
a) electrical resistance is ohm
electrical resistivity is ohm metre
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