Physics-10th Electricity CBSE Board 2024 Medium
(i) Write the relation between resistance R and electrical resistivity \rho of the material of a conductor in…
- (i)Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of cylinder of length and area of cross-section . Hence derive the SI unit of electrical resistivity.
- (ii)The resistance of a metal wire of length m is . If the area of cross-section of the wire is , calculate the electrical resistivity of the wire.
- (iii)State how would electrical resistivity be affected if the wire (of part ‘ii’) is stretched so that its length is doubled. Justify your answer.
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