The value of resistivity for insulator is of the order of____________?
Correct answer: D. 108 ohm metre
- A. 105 ohm metre
- B. 106 ohm metre
- C. 107 ohm metre
- D. 108 ohm metre
Explanation
Insulators have very large resistivities, and the standard approximate value used in this classification is about 10^8 ohm metre, much greater than semiconductor or conductor values. The likely mistake is choosing 10^7 ohm metre because it is also large, but 10^8 ohm metre is the listed textbook order for an insulator.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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