Figure shows two point charges, q and q'. moving relative to an observer at point P. Suppose that the lower charge is actually negative, with q' = -q.
(a) Find the magnetic field (magnitude and direction) produced by the two charges at point P if (i) u' = u 12; (ii) u' = u; (iii) u· = 2u.
(b) Find the direction of the magnetic force that q exerts on q'. And find the direction of the magnetic force that q' exerts on q.
(c) If u = u' = 3.00 X 105m/s. what is the ratio of the magnitude of the magnetic force acting on each charge to that of the Coulomb force acting on each charge?

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