A metal bar of length 1 m and area of cross-section 1 mm2 is clamped between two rigid supports. For the material of rod, its Young's modulus is Y=1011 N/m2 and coefficient of linear expansion is α=1.8×10−5 ∘C−1. If the temperature of the rod is decreased by ΔT=10∘C, the force exerted by the rod on the supports is