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Question

The unit of specific resistance is


A

Ohm/cm2

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B

Ohm/cm

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C

Ohm-cm

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D

(Ohm-cm)–1

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Solution

The correct option is C

Ohm-cm


The explanation for the correct answer:-

Option (C)

  1. The specific resistance of a material is a measure of the resistance, that it offers to the flow of current through it.
  2. From the specific resistance formula, ρ=R×AL=(Ohmxcm2)cm=Ohm×cm
  3. Resistivity is ρ when resistance R is expressed in Ohm (Ω) and distances are expressed in centimeters (cm).
  4. In this convention, the unit of resistivity is Ohm-cm (Ω.cm).

Hence option C is the correct answer.


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