2010 3 A tiny spherical oil drop carrying a net charge q is balanced in...
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2010 3 A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength 81m x 105 Vm When the field is switched off the drop 7 ms 1 is observed to fall with terminal velocity 2 10 ms 2 viscosity of the air 1 8x 10 5 N sm 2 and the density of oil 900 kgm Given g 9 8 ms 3 AIEEE the magnitude of q is a 1 6 10 C c 4 8 10 9 C b 3 2x 10 9 C d 8 0x C
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