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Three point charges are located on a circular arc as shown in the figure below. (Take r = 4.40 cm. Let to the right be the +x direction and up along the screen be the +y direction.)
+3.00 nC
-2.00 nC
r
30.0°
=
30.0°
+3.00 nC
P
(a) What is the total electric field at P, the center of the arc?
E=
=
ÎN/C +
ĴN/C
(b) Find the electric force that would be exerted on a -4.75-nC point charge placed at P.
F
ÎN +
ĴN
CTICE

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