Consider a fixed uniformly charged insulating sphere with radius R and total charge +Q . A point charge -q ( q<<Q ) with mass m is released from rest at a distance of 3R from the centre of the charged sphere. When the point charge reaches the surface of the sphere, its speed is: ( 0 is the permittivity of vacuum, neglect gravitational forces).

1. A. 3Qq 4 0 mR
2. B. 2Qq 3 0 mR
3. C. Qq 3 0 mR
4. D. Qq 4 0 mR

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