A particle with charge q and momentum p, initially moving along the x axis, enters a region where a uniform magnetic field B0 extends over a width x = â„“ as shown in Fig. 20-70. The particle is deflected a distance d in + y the direction as it traverses the field. Determine

(a) Whether q is positive or negative, and

(b) The magnitude of its momentum p in terms of q, B0, l, and d.

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