If a drop is to be deflected a distance d = 0.340 mm by the time it reaches the end of the deflection plate, what magnitude of charge q must be given to the drop? Assume that the density of the ink drop is 1000 kg/m3 , and ignore the effects of gravity. Express your answer numerically in coulombs.

no. dot product   =0 when vecs at right angles

i think its c if i'm wrong

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hope this !