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21 Feb 2009 16:11:07 IST
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how is the work done by magnetic field on a charged particle zero?
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F(vector) = q* v(vector) x B(vector)..........so F is perpendicular to v vector i.e. F is perpendicular to ds/st and so F is perp. to ds........now, W= Fs cos90 = 0 .....RATE IF SATISFIED.
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