The charged particles are at equal distances, 500 cm from the origin. a) Determi

Question

The charged particles are at equal distances, 500 cm from the origin.
a) Determine the magnitude of the net electric field at the origin, for each case.
b) in cases (i) and (ii), determine the magnitude and direction of the net force on charges -5q; and in cases (iii) and (iv), determine the magnitude and direction of the net force on charges -q

The figure please refer to the slide below...(page15)
https://docs.google.com/viewer?a=v&q=cache:biT2H6ZnKeMJ:zitompul.files.wordpress.com/2011/03/phy2-lecture7-02.ppt figure shows

anyone can help me to solve this question?

Explanation / Answer

electric fiel= k q/r^2 =9*10^9 /q/(5)^2 =2.8 *10^8q N

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