28. We consider the point at which it enters the field-filled region, velocity vector pointing downward. The field points out of the page so that GGvB×points leftward, which indeed seems to be the direction it is “pushed’’; therefore, q> 0 (it is a proton). (a) Eq. 28-17 becomes p2/||TmeBπ=G, or ()( )2791921.67102 130 10
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