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Unformatted text preview: q is at coordinate x = 0, y =b . +2b x y (a) Evaluate the electric feld (magnitude and direction) on the x axis. Show that ±or x À b ,  ~ E ∝ 1 /r 3 . What is the direction in this limit? (b) Evaluate the electric feld on the y axis. Find the magnitude and direction ±or y À b . 9. Coulomb ±orce between line charges (15 pts): A rod o± length l 1 with line charge density λ 1 and a rod o± length l 2 with line charge density λ 2 lie on the x axis. Their ends are separated by a distance D as shown in the fgure. l l D 1 2 (a) What is the ±orce ~ F between these charges? (b) Show that for D À l 1 and D À l 2 , this force reduces to the Coulomb forces between a pair of point charges, q 1 = l 1 λ 1 , q 2 = l 2 λ 2 ....
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 Spring '08
 Hughes
 Electric Fields, Force, Mass, pts, Electric charge, Purcell, line charge density

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