The drawings show three charges that have the same magnitude but may have differ

Question

The drawings show three charges that have the same magnitude but may have different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|= 4.3 C, and the distance between them is d = 2.8 mm. Determine the magnitude of the net force on charge 2 for each of the three drawings.

a. I got the answer of 42451.52N

b. I got the answer of 0 N

c. However I cannot figure this part out. I tried F= sqrt2 x 42451.52 = 60035.529N which was marked wrong.

Explanation / Answer

F12 = kq1q2/d2 = 9*109*(4.3*10-6)2/0.00282 = 21225.76 N

which is same as F32 as values involved are same

Now

net force = (2*21225.762)0.5 = 30017.765 N

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