a) A positive charge's velocity v is directed up in a magnetic field B directed to the left, like this v↑+B [Select] b) A positive charge's velocity v is directed down in a magnetic field B directed out of the page, like this v OB[Select]
In the last lesson, Lorenz's Law was applied to a current I traveling along a length of wire L, described by the formula, F-ILBsin(theta) In this lesson, Lorenz's Law is applied to a point charge q moving at velocity v, described by the formula, F-quBsin(theta) See how the IL is replaced by qv? Their units are the same: IL has units of amps meter and qv has units of C meter/s (amps is C/s). When applying the three-finger right-hand rule (RHR), the index "pointer" finger used for the direction of current is also used for the direction of the charge's velocity. In each scenario below, use the RHR to determine the direction of force: a) A positive charge's velocity v is directed up in a magnetic field B directed to the left, like this v /\ < B [Select] b) A positive charge's velocity v is directed down in a magnetic field B directed out of the page, like this v \/ o B [Select]
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