1. The problem statement, all variables and given/known data Suppose the particle has a charge q = 2.5 μC and is moving with a velocity of magnitude v = 1.0 × 103 m s−1, in a direction parallel to the wire and in the same direction as the current. The particle is at distance d = 1.5 mm from the wire and experiences a force of magnitude 1.0 × 10−6 N. Calculate the current in the wire. Draw a diagram to indicate the direction of the force on the particle. 2. Relevant equations F = qvBsin 3. The attempt at a solution I really have no idea how to tackle this. I'm not even sure that I'm using the correct equation. This question follows another which asks for an expression for the magnitude of the magnetic field strength, B, and just assumed that this eqn would apply here. We have F, q, v and d, but not sure how we get i, and neither B to be honest. Some hints and advice would be greatly appreciated!