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**Unformatted text preview: **21.50: For a ring of charge, the electric field is given by Eq. (21.8). 1 Qx ^ i so with a) E = 2 40 ( x + a 2 )3 2 ^ Q = 0.125 10-9 C, a = 0.025 m and x = 0.4 m E = 7.0i N C . -6 -5 ^ ^ b) Fon ring = - Fon q = - q E = - ( - 2.50 10 C) (7.0i N C) = 1.75 10 i N. ...

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