$\displaystyle R$ is charged with a charge $\displaystyle q$. It is then placed over an infinitely large **grounded** conducting plane at a height $\displaystyle h$, as shown in the figure above.

Find the magnitude of the surface charge density $\displaystyle \sigma$ (in C/m$^2$) of the induced charge at the point on the plane which is exactly **below** the ring's center.

**Details and Assumptions**

$\bullet$ $\displaystyle q = 2\ \mu\text{C}$

$\bullet$ $\displaystyle R = 10\text{ cm}$

$\bullet$ $\displaystyle h = 15\text{ cm}$

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