Answer :

Here the point P1 lies outside the sphere but inside the shell. We know the electric field inside the shell is zero. Therefore, only the sphere gives rise to the field.

The distance of P1 from the center of the sphere is x=4a -a +a = 4a


Therefore, electric field


Field at P2 is due to both the sphere and the shell.


The distance of from the center of the sphere is x = 4a+a+a = 6a.


Therefore, the field is


The distance of from the center of the sphere is x = 4a+a= 5a.


Therefore, the field is


The total electric field is thus


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