Chapter 27.5, Problem 27.5TYU

In Example 27.6 He⁺ ions with charge +e move at 1.00 × 10⁵ m/s in a straight line through a velocity selector. Suppose the He⁺ ions were replaced with He²⁺ ions, in which both electrons have been removed from the helium atom and the ion charge is +2e. At what speed must the He²⁺ ions travel through the same velocity selector in order to move in a straight line? (i) 4.00 × 10⁵ m/s; (ii) 2.00 × 10⁵ m/s; (iii) 1.00 × 10⁵ m/s; (iv) 0.50 × 10⁵ m/s; (v) 0.25 × 10⁵ m/s.