A unit positive point charge is taken slowly through an infinitesimally thin tube that is inside a charged dielectric sphere of radius R , having uniform positive charge density , as shown in the figure. The initial and final positions of the charge are marked by A and B at distance 2R and 3R respectively, from the centre of the sphere. In this process, the magnitude of the total work done on the point charge is R 2 n 0 . The value of n is: ( 0 is the permittivity of vacuum)

1. A. 2
2. B. 6
3. C. 9
4. D. 18

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