Three spiders are resting on the vertices of a triangular web.?

Three spiders are resting on the vertices of a triangular web. The sides of the triangular web have a length of a = 0.57 m, as depicted in the figure. Two of the spiders (S1 and S3) have +4.2 µC charge, while the other (S2) has −4.2 µC charge.

Three spiders are resting on the vertices of a triangular web

(a) What are the magnitude and direction of the net force on the third spider (S3)?
direction ° counterclockwise from the +x-axis

(b) Suppose the third spider (S3) moves to the origin. Would the net force on the third spider (S3) be greater than, less than, or equal to the magnitude found in part (a)?
-greater than in part (a)
-less than in part (a)
-equal to the part (a)

(c) What are the magnitude and direction of the net force on the third spider (S3) when it is resting at the origin?

magnitude N
direction ° counterclockwise from the +x-axis

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