1. A particle with charge q is traveling at a speed 1' in the direction indicated. A uniform magnetic eld is piesent; its magnitude is B and its direction is shown. TtFI.-'l'1at is the magnitude and direction of the uniform electric field that would have to be present to ensure that the particle travels in a straight line? (Give answer in terms of B: r: and q.) 5. Explain why two rectangular har magnets will attract or repel each other: depending on how the poles are oriented with respect to each other. Sketch two diagrams; one showing attraction and the other showing repulsion. Label north and south poles of each magnet= and indicate the direction of ow of the net current \"inside\" each bar magnet {that is? the electric current that originates from the movement of electrons inside the atoms of the magnetic material}