A spherical volume of radius ‘a’ has a uniform charge density ρ. What is the electric displacement D on the surface of the sphere?

1
\(\frac{4}{3}\rho {a^3}\)
2
πρa2
3
\(\frac{1}{3}\rho a\)
4
\(\frac{4}{3}\pi \rho {a^2}\)

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