Key Idea : In stretching, specific resistance remains unchanged. After stretching, specific resistance (ρ) will remain same. Original resistance of the wire, R=Aρl R∝Al or R∝Vl2 (as V=Al) and R′∝V(l+10%l)2 Therefore, RR′=l2(l+10010l)2 RR′=l2(1011l)2=100121 R′=1.21R