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A continuous line of charge lies along the x axis, extending from x = +x0 to positive infinity. The line carries positive charge with a uniform linear charge density ?0.

(a) What is the magnitude of the electric field at the origin? (Use the following as necessary: ?0, x0, and ke.) B =

________________

(b) What is the direction of the electric field at the origin? +x ?x +y ?y +z ?z

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