Suppose the Ends of a 20-M Long Steel Beam Are $\degree$

Suppose the ends of a 20-m long steel beam are rigidly clamped at 0 $\degree$ C to prevent expansion. The rail has a cross-sectional area of 15 cm². What force does the beam exert when it is heated to 40 $\degree$ C? ( $\alpha$ _steel = 1.1 * 10 ^{- 5}/C $\degree$ , Y_steel = 2.0 * 10¹¹ N/m²)

A) 2.6 *0 10⁵ N
B) 5.6 * 10⁴ N
C) 1.3 * 10⁵ N
D) 6.5 * 10² N