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Three concentric conducting spherical shells of radii `R, 2R` and `3R` carry charges `Q, - 2Q` and `3Q`, respectively.

a. Find the electric potential at `r=R` and `r=3R` where r is the radial distance from the centre. ltbr. b. Compute the electric field at `r=5/2R`
`c. compute the total electrostatic energy stored in the system.
The inner shell is now connected to the external one by a conducting wire, passing through a very small hole in the middle shell. ltbr. Compute the charges on the spheres of radii R and `3R`.
e. Compute the electric field at `r=5/2R`.

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