Electrostatic Equillibrium!
A wheel has mass and charges and on diametrically opposite points. It remains in equilibrium on a sufficiently rough inclined plane in the presence of a uniform electric field directed vertically upwards. Find the magnitude of this electric field.
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Draw the free body diagram. Calculate torque about the point of contact with the wedge...friction and -q charge has zero torque qE×2r=mg×r....then trivial.