A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength . when the field is switched off, the drop is observed to fall with terminal velocity 2 × 103 ms1. given g = 9.8 ms2, viscosity of the air = 1.8 × 105 ns m2 and the density of oil = 900 kg m3, the magnitude of q is
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Explanation:when drop is balanced in still air under the effect of Electric field.
qe=4/3Πrcube P g.
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