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A tiny spherical oil carrying a net charge q is balanced in still air with a vertical uniform electric field of strength 81π7×105 V m−1. When the field is switched off, the drop is observed to fall with terminal velocity 2×10−3 ms−1. Given, g=9.8 ms−2, viscosity of the air =1.8×10−5 Ns m−2 and the density of oil =900 kg m−3, the magnitude of q is |
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Answer» A tiny spherical oil carrying a net charge q is balanced in still air with a vertical uniform electric field of strength 81π7×105 V m−1. When the field is switched off, the drop is observed to fall with terminal velocity 2×10−3 ms−1. Given, g=9.8 ms−2, viscosity of the air =1.8×10−5 Ns m−2 and the density of oil =900 kg m−3, the magnitude of q is |
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