C-06-Q050mediumsingle_mcqThe formula for length after heating is —aL2=L1−αL1(T2−T1)L_2 = L_1 - \alpha L_1 (T_2 - T_1)L2=L1−αL1(T2−T1)bL2=L1+αL1(T2−T1)L_2 = L_1 + \alpha L_1 (T_2 - T_1)L2=L1+αLcL2=L1(T2−T1)L_2 = L_1 (T_2 - T_1)L2=L1(T2dL2=α(T2−T1)L_2 = \alpha (T_2 - T_1)L2=α(T2−T