A ring-shaped conductor with radius a2.50 cm has a total positive charge Q+0.130

Question

A ring-shaped conductor with radius a2.50 cm has a total positive charge Q+0.130 nC uniformly distributed around it, as shown in the figure below. The center of the ring is at the origin of coordinates O ds dE (a) What is the electric field (magnitude and direction) at point P, which is on the x-axis at x-60.0 cm? N/C | Select- b A point charge q =-2.50 C is placed at the point P described in part a what are the magnitude and direction of the force exerted by the charge q on the ring? N --Select-a.

Explanation / Answer

(A) E = (k Q x) / (x^2 + a^2)^(3/2)

E = (9 x 10^9 x 0.130 x 10^-9 x 0.60) / (0.60^2 + 0.025^2)^(3/2)

E = 3.24 N/C

to the right (along +ve x axis)

(b) F = q E

F = 8.10 x 10^-6 N

to the left (along -ve x axis )

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