IIT JEE Advanced 2010 Paper 2

Section: Physics

Question : 3 of 57

Marks: +1, -0

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

[JEE Adv 2010 P2]

1.6 × 10−19C
3.2 × 10−19C
4.8 × 10−19C
8.0 × 10−19C

Validate

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