# Grounded conducting hollow sphere

## Homework Statement

A grounded conducting hollow sphere of radius a contains a ring of radius b and charge per unit length $$\Lambda$$. The ring is coaxil to the z axis, and with the sphere lies a distance d about the center of the sphere such that d^2 + b^2 < a^2. Find the potential within the sphere along the z-axis

d^2 + b^2 < a^2.

## The Attempt at a Solution

Honestly I dont know where to start. Reading Griffiths chapter 3.3 I attempted using the separation of variables but had no idea had to proceed. So now I am attempting on using the law of cosines and concentrating on the part where the radius of the charged ring and the center of the sphere make a triangle. However, i doubt this is right. Any help to push me in the right direction to solving this problem is greatly appreciated!

Thanks