Electric field strength inside the uniform charged sphere is zero.

therefore∴  As one penetrates through uniformly charged sphere, electric field strength inside the sphere becomes zero

Introduction:
When penetrating a uniformly charged conducting sphere, the electric field strength (E) can be determined by considering the distribution of charge within the sphere and the principles of electrostatics.

Explanation:

1. Electric Field Inside a Conductor:
Inside a conductor, the electric field is zero. This is because when a conductor is in electrostatic equilibrium, the charges within it redistribute themselves in such a way that the electric field inside cancels out. Therefore, the electric field strength (E) inside a conducting sphere is zero.

2. Electric Field at the Surface:
At the surface of the conducting sphere, the electric field strength is not zero. The electric field lines are perpendicular to the surface and point outward. The electric field strength at the surface is given by E = σ/ε₀, where σ is the charge density on the surface and ε₀ is the permittivity of free space.

3. Penetrating the Conducting Sphere:
As one penetrates a uniformly charged conducting sphere, the electric field strength remains the same as at the surface. This is because the charge distribution within the sphere is uniform, and the electric field lines are radial and symmetric. Therefore, the electric field strength inside the conducting sphere remains constant.

4. Explanation of Options:
A) The electric field strength does not increase as one penetrates the conducting sphere.
B) The electric field strength does not decrease as one penetrates the conducting sphere.
C) The electric field strength remains the same as at the surface throughout the sphere.
D) The electric field is not zero at all points, only at the surface and inside the conducting sphere.

Conclusion:
When penetrating a uniformly charged conducting sphere, the electric field strength (E) remains the same as at the surface throughout the sphere. The electric field inside the conducting sphere is zero, but at the surface, it is non-zero and given by E = σ/ε₀.