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Resistivity Question

Q1.

(a) A metal wire of length 1.4 m has a uniform cross-sectional area = 7.8 × 10–7 m2. Calculate the resistance, R, of the wire. resistivity of the metal = 1.7 × 10–8 Ωm

(2 marks)

(b) The wire is now stretched to twice its original length by a process that keeps its volume constant. If the resistivity of the metal of the wire remains constant, show that the resistance increases to 4R.

(2 marks)

(Total 4 marks)