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.

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The Answer of 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.

In the Figure,a Ring 0