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`theta_1= 20^@C` , theta_2= 100^@C` <br> `A= 2 mm^2 = (2 xx (10^-6) (m^2))` <br> ` (alpha_steel) = (12 xx 10^-6 /(^@C)` <br> `Y_steel = (2 xx (10^11N))/(m^2)` <br> Force exerted on th clamps = ? <br> `(F/A) / strain = Y ` <br> ` F= (Y xx (Delta L))/ L xx A ` <br> ` = (YL alpha Delta theta A) / L = ( YA alpha Delta theta)` <br>` =2 xx 10^11 xx 2 xx 10^-6 xx 12` <br> ` xx 10^-6 xx 80` <br>` = 48 xx 80 xx 10^-1 = 384N`