In the Figure,a Ring 0

Multiple Choice

In the figure,a ring 0.71 m in radius carries a charge of + 580 nC uniformly distributed over it.A point charge Q is placed at the center of the ring.The electric field is equal to zero at field point P,which is on the axis of the ring,and 0.73 m from its center.(ε₀ = 8.85 × 10^-12 C²/N • m²) The point charge Q is closest to

A) -210
B) -300
C) -420
D) 210
E) 300