(Solved): hree point charges are located on a circular arc as shown in the figure below. (Let r=4.20cm. Ass ...

hree point charges are located on a circular arc as shown in the figure below. (Let $$r=4.20\mathrm{cm}$$. Assume that the $$+x$$ axis is to the right and the $$+y$$-axis is up along the page.) (a) What is the total electric field at $$P$$, the center of the are? magnitude $$\mathrm{N}/$$ direction. (b) Find the electric force that would be exerted of a $$+4.54$$ nC point charge placed at $${?}_n$$ magnitsoe direction