Which of the following statements are true with regard to resistivity?
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A more general definition of the temperature coefficient of resistivity is given below
α=1/Ï*dÏ/dt
where Ï is the resistivity at temperature T.
a) Assuming that α is constant, show that Ï equals the following expression where Po is the resistivity at temperature To.
b)using the series expansion ex = 1 + x for x « 1, show that the resistivity is given approximately by the expression Ï=p0[1 + α(T-TO)] .Â
Which, among the following is a unit for resistivity?