Resistance of an ideal insulator is __________________?
Correct answer: A. infinite
- A. infinite
- B. zero
- C. finite
- D. depends upon nature
Explanation
An ideal insulator does not allow current to flow, which is represented by infinite resistance. Option c, finite resistance, describes a real material that permits a small leakage current rather than an ideal 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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