ing of charge is centered at the origin in the vertical direction. The ring has
ID: 1918899 • Letter: I
Question
ing of charge is centered at the origin in the vertical direction. The ring has a charge density of lambda = 6. 93 times 10-6 C/m and a radius of R = 3. 41 cm. Find the total electric field, E, of the ring at the point P = (1. 10 m, 0. 00 m). The Coulomb torce constant Is k= V(4pi 0) = 8. 99 times 109 N m2/C2. Find the expression for the electric field, E-, of the ring as the point P becomes very far from the ring (x >> R) in terms of the radius R, the distance x, the total charge on the constant k = 1/(4pi 0).Explanation / Answer
a)E=2rkx/(x2+r2)1.5
Substituting values
E=11028N/C
b)The equation for x>>R reduces to
E=2rk/x2
or the ring behaves like a point charge.
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