A uniform non conducting ring has mass m and radius R. tow point charges q and q' are fixed on its circumference at a separation of sqrt(2)R the ring remains in equilibrium in air with its plane vertical in a region where exists a uniform vertically upward electric field E. Given E=(4mg)/(7q) (a) Find angle theta in equilibrium position (see figure). (b) The ring is given a small rotation in the plane of the figure and released. Will it perform oscillations?

A uniform non conducting ring has mass m and radius R. tow point cha

1.	A uniform non conducting ring has mass m and radius R. tow point charges q and q' are fixed on its circumference at a separation of sqrt(2)R the ring remains in equilibrium in air with its plane vertical in a region where exists a uniform vertically upward electric field E. Given E=(4mg)/(7q) (a) Find angle theta in equilibrium position (see figure). (b) The ring is given a small rotation in the plane of the figure and released. Will it perform oscillations?
Answer» Answer :(a). `theta=tan^(-1)((3)/(4))` (B). Yes

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