Which of the following wires expanded the least at 80^circ C A Brass A B Nickel B C Copper C D ) Aluminum

To determine which wire expanded the least at , we need to consider the coefficient of linear expansion for each material.The coefficient of linear expansion (α) is a measure of how much a material expands or contracts per degree change in temperature. The lower the coefficient, the less the material will expand or contract.Let's compare the coefficients of linear expansion for the given materials:A) Brass: α ≈ 19 x 10^-6 /°CB) Nickel: α ≈ 13 x 10^-6 /°CC) Copper: α ≈ 16.5 x 10^-6 /°CD) Aluminum: α ≈ 23 x 10^-6 /°CBased on the coefficients, we can see that Nickel (B) has the lowest coefficient of linear expansion, which means it will expand the least at .Therefore, the correct answer is B) Nickel.