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KCET 2022 Physics Solved Paper

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Question : 3

Total: 60

A tiny spherical oil drop carrying a net charge q is balanced in still air, with a vertical uniform electric field of strength ‌

π×105V∕m. When the field is switched off, the drops is observed to fall with terminal velocity 2×10−3ms−1. Here g=9.8m∕s2, Viscosity of air is 1.8×10−5‌Ns∕m2 and the density of oil is 900‌kg‌m−3. The magnitude of ' q′ is

1.6×10−19C
3.2×10−19C
0.8×10−19C
8×10−19C

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