Suppose you have two infinite straight line charges λ, a distance d apart, moving along at a constant speed v. how great would v have to be in order for the magnetic attraction to balance the electrical repulsion? work out the actual number. is this a reasonable sort of speed?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.