Electric FieldHardQuestion 31479
Question
Charge Q is uniformly distributed on surface of a sphere of radius R. Electric field at the surface:
- AkQ/R
- BkQ/R² (same as point charge at surface)Correct
- CZero
- D2kQ/R²
Correct answer
kQ/R² (same as point charge at surface)
Explanation
By Gauss's law: E at surface = kQ/R² — same as if all charge were at centre. This is the shell theorem result.