A conducting sphere of radius \(R\) with a layer of charge \(Q\) distributed on its surface has the electric potential everywhere in space:

\[V = \begin{cases} \dfrac{1}{4\pi \epsilon_0} \dfrac{QR^2}{r^3} \sin \theta \cos \theta \cos \phi, \ \ r>R \\ \dfrac{1}{4\pi \epsilon_0} \dfrac{Qr^2}{R^3} \sin \theta \cos \theta \cos \phi, \ \ r<R. \end{cases}\]

Which of the following gives the surface charge density on the surface of the sphere?

\(\)

**Note:** Recall that the change in electric field across either side of a conductor is equal to \(\frac{\sigma}{\epsilon_0},\) where \(\sigma\) is the surface charge density.

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