Q24 of 330 Page 27

Name two factors on which the resistivity of a substance depends and two factors on which it does not depend.

Resistivity of a substance depends on the nature of the substance and its temperature. It does not depend on the length or thickness of the conductor.


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24

State the SI unit of resistivity.

 24

Distinguish between resistance and resistivity.

 24

The resistance of a metal wire of length 1 m is 26 Ω at 20° C. If the diameter of the wire is 0.3 mm, what will be resistivity of metal at that temperature?

 25

The resistance of a wire of length 300 m and cross-section area 1.0 mm2 made of material of resistivity 1.0 x 10-7 Ω m is :