A small metal sphere carrying charge +Q ...

A small metal sphere carrying charge +Q is located at the centre of a spherical cavity inside a large uncharged metallic spherical shell as shown in the figure. Use Gauss’s law to find the expressions for the electric field at points `p_(1)` and `p_(2)` . Also draw the pattern of electric field lines in this arrangement.

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Charge on the inner surface is -Q and charge on outer surface is +Q .
Electric field at point `P_1`
`E=1/(4piepsilon_0)Q/r_1^2`

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