Latest IIT-JEE Aptitude Question SOLUTION: A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength 81pie/7* 10^5Vm^–1. When the field is switched off,

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(#M40027920) IIT-JEE question 2010 question Keep an EYE

A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field
of strength 81pie/7* 10^5Vm^–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

Asked In IIT-JEE MAN (10 years ago)

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