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 and -2q located at A(2 m, 0, 0) and B(8 m, 0, 0) respectively, we can follow these steps:

### Step 1: Understand the Configuration
We have:
- A spherical surface of radius \( R = 4 \) m centered at the origin (0, 0, 0).
- A positive point charge \( +q \) located at point A(2 m, 0, 0).
- A negative point charge \( -2q \) located at point B(8 m, 0, 0).

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