3. A negatively charged particle of charge -q is moving at velocity v in the external magnetic field of the infinitely long straight wire that runs along the x-axis and is carrying the electric current. 1) At the instance when the particle is at distance a from the wire, what is the direction of the current in the wire if the magnetic force Fmag on the particle is 0=370 with +y-axis? 2) Find the electric current in terms of Fmag, q, a, v, and 0. y O Fmag 320 X