A total charge Q = 3.8 ?C is distributed uniformly over a quarter circle arc of

Question

A total charge Q = 3.8 ?C is distributed uniformly over a quarter circle arc of radius a = 6.1 cm as shown. question one: What is ? the linear charge density along the arc? (answer : 0.000039678 C/m) Question 2: What is Ex, the value of the x-component of the electric field at the origin (x,y) = (0,0) ? (answer: -5854131.148 N/C) QUestion 3: What is Ey, the value of the y-component of the electric field at the origin (x,y) = (0,0). ( answer: -5854131.148 N/C) Question 4: What is the magnitude of the electric field at the origin produced by a semi-circular arc of charge = 7.6 ?C, twice the charge of the quarter-circle arc?/Users/library/Desktop/Screen shot 2013-01-28 at 3.18.35 PM.png. the link for the pic is for the last question. answer for the last question has to be in newton/coulomb

Explanation / Answer

PLEASE RATE ME AND AWARD ME KARMA POINTS IF IT IS HELPFUL FOR YOU You already have q = -295e. The length is not necessarily 2pR because that is the length of the whole circumference of a circle. The required length is 2pR/10, since 36 degrees is one-tenth of a full circle. So l = 2pR/10, R = 3.90 cm, l = 2.45 cm. Then just use q/l.

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