Cross section area of solid cylindrical steel wire is A = 300 cm2 and its Young's modulus is 2 x 1011 N/m2. How much tension force is required so that the stretching in the wire becomes 2% ?
(1) 1.2 x 106 N
(2) 1.2 x 107 N
(3) 1.2 x 109 N
(4) 1.2 × 108 N