A circular ring of radius carries a uniform linear charge density of
PHYSICS · Subjective · AP · Physics C: Electricity and Magnetism · Electric Charges Fields and Gauss's Law · Electric Charges Fields and Gauss's Law
Problem
A circular ring of radius 0.20m carries a uniform linear charge density of 8.0×10−6Cm−1. A point charge 5.0×10−9C is placed on the axis of the ring at a point 0.30m from its centre.
(i) Write the standard expression for the magnitude of the electrostatic force exerted by the ring on the point charge in terms of the given quantities.
(ii) Substitute the numerical values to determine the force and state its direction with respect to the ring.