An Aluminum Rod Is 20

Multiple Choice

An aluminum rod is 20.0 cm in length, has a diameter of 10.0 mm and is at a temperature of 20°C. The coefficient of linear expansion of aluminum is 23.0 × 10⁻⁶/°C. If the temperature changes to 50°C, then the increase in diameter of the aluminum rod is

A) 4.0 × 10⁻³ mm.
B) 4.9 × 10⁻³ mm.
C) 5.6 × 10⁻³ mm.
D) 6.0 × 10⁻³ mm.
E) 6.9 × 10⁻³ mm.