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Shown in the figure is a shell made of a conductor. It has inner radius a and outer radius b, and carries charge Q. At its centre is a dipole P G as shown. In this case; p G

1. surface charge density on the inner surface is uniform and equal to 2 a 4 ) 2 / Q ( π
2. surface charge density on the outer surface depends on p G
3. surface charge density on the inner surface of the shell is zero everywhere
4. electric field outside the shell is the same as that of a point charge at the centre of the shell

Correct answer: electric field outside the shell is the same as that of a point charge at the centre of the shell

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