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Unformatted text preview: dΦ B dB dB ε qr dB =A = πr 2 and F = qE = q = , to the dt dt dt 2πr 2 dt left. At point b , the field is the same magnitude as at a since they are the same distance qr dB , but upward. from the center. So F = 2 dt At point c, there is no force by symmetry arguments: one cannot have one direction picked out over any other, so the force must be zero.
29.67: At point a : ε = ...
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