v Part C A long, horizontal wire is carrying a current I. A particle of mass m and charge q is fired horizontally at a speed '00. Write down an explicit expression for the gravitational torce acting on the particle. The initial velocity of the particle is parallel to the wire, and its initial position is a distance 7' directly below the wire, as Express your answer in terms of m and the acceleration of gravity 9. shown in gw). What initial speed must the particle have for it to travel in a straight line? Do not ignore gravity. > View Available Hint(s) Express your answer in terms of I, m, q, r, m], and the acceleration of gravity 9. "hO-J? Fg =