Discussion
A unit of specific resistance of a conductor is -
Answer: D
A unit of specific resistance is the ohm-cm.
Specific resistance (resistivity) is defined by \(R = \rho l / A\), so \(\rho = RA/l\). Its units are ohm multiplied by area divided by length: ohm × cm2 / cm = ohm-cm, or in SI the ohm-metre.
Ohm per cm is resistance per unit length, and ohm per square or cubic centimetre come from dividing by area or volume instead of multiplying by area and dividing by length.
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