Hi, Question: There are two long, parallel vertical wires, each carrying currents in the same direction. The wire passes through a horizontal sheet of card. The card is removed and one of the two wires is free to move. Describe and explain the changes in velocity, and in acceleration of the moveable wire. Answer: Well, so, I believe that, since there is an attractive force between both of the wires, if the card is removed, the moveable wire will move towards the second wire. This means that there is a change in velocity of the wire, an acceleration, that increases as the moveable wire moves towards the second wire due to the fact the field is stronger closer to the wire. Is that what they want? Thanks, Peter G.