Question

1)The direction of the force on doubly ionized helium atoms(alpha particles)moving at right angles to a magnetic field is opposite to the direction of the force given by the third right-hand rule.

true.

2)The electromotive force is a force that makes charges flow from a point of higher potential to lower potential.

false. from low to high

Answer 1

I have no idea on the first. THe term third right-hand rule must be unique to your text.

On the second, it depends on what kind of charges you are discussing: positive, or negative. Wouldn't that matter?