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A ring-shaped conductor with radius a = 2.50cm has a total positive charge Q = 0.125 nC uniformly distributed around it. The center of the ring is at the origin of coordinates, (x,y,z) = (0,0,0).

a) What is the electric field (magnitude and direction) at a point with coordinates (x, y, z) = (40.0cm, 0, 0)?

b) A point charge q = ?2.50?C is placed at the point described in part (a). What are the magnitude and direction of the force exerted by the charge on the ring?
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Added Thu, 03 Sep '15
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E = kxQ/(x^2+r^2)^1.5

= 9*10^9*.4*.125*10^-9/(.4^2+.025^2)^1.5

= 6.99 N/C

direction is along +ve x axis

F = qE = 6.99* 2.5*10^-9

= 1.747*10^-8 N

along -ve x axis
Edit
Added Thu, 03 Sep '15
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