(ii) An electric oven is designed to work on the mains voltage of 220 V . This oven consumes 11 units of electrical energy in 5 hours. Calculate: 5 (ii) The resistance of a metal wire of length 3 m is $60 \Omega$. If the area of cross-section of the wire is $4 \times 10^{-2} \mathrm{~m}^{2}$, 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. Q. Nos. 37 to 39 are source-based/case-based questions with 2 to 3 short sub-parts. Internal choice is provided in one of these sub-parts:
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