Given, area of cross-section, tension, elongation, length and Young's modulus of copper and steel wire be AC\;AS,TC\;TS,∆lC\;∆lS,lC\;lS and YC\;YS, respectively. and AC‌‌=AS TC‌‌=TS ∆lC‌‌=∆lS YC‌‌=2×1011N∕m2 YS‌‌=1.1×1011N∕m2 As we know that, ‌Y‌‌=‌