Question

State how would electrical resistivity be affected if the wire (of part 'ii') is stretched so that its length is doubled. Justify your answer.

Answer 1

When a wire is stretched to double its length, its electrical resistivity (ρ) remains constant. A material's electrical resistivity is intrinsic and does not alter its dimensions (length, cross-sectional area). Therefore, doubling the length of the wire will not affect its electrical resistance.