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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Jun 2008 22:19:45 IST
Accepted Answer [?]
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force due to Q = KQ^2/2a^2
direction - north west
force due to q = K qQ/a^2
direction two forces are there one due to east and other south
now the net force is zero
so resulatant of force ny q = root (KqQ/a^2)^2 + (kqQ/a^2)^2
the angle between them is 90
= root2 kQq/a^2
this will be equal to force due to Q
root 2 KQq/a^2 = KQ^2/2a^2
Q = 2root2 *q
and as already stated it is negative
so the final answer is
Q = - 2root2 q
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this reply: 22 points
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