Consider a spherical surface of radius 4 m cenred at the origin. Point charges +q and - 2q are fixed at points A( 2 m, 0,0) and B( 8 m, 0, 0), respectively. Show that every point on the shperical surface is at zero potential.

Explanation

To show that every point on the spherical surface of radius 4 m centered at the origin is at zero potential due to the point charges +q at A(2 m, 0, 0) and -2q at B(8 m, 0, 0), we will follow these steps:

### Step 1: Identify the coordinates of the charges and the spherical surface
- The charge +q is located at point A(2, 0, 0).
- The charge -2q is located at point B(8, 0, 0).
- The spherical surface is centered at the origin (0, 0, 0) with a radius of 4 m.

### Step 2: Define a point P on the spherical surface
...