three point charge q ,q and - q are placed at the corner of an equilateral triangle of side a . another charge q is kept at the centroid of triangle .force exerted on q is
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Answer:
cos30
0
=
2x
a
x=
2
3
2a
x=
3
a
The net force on x axis is cancelled by the below two (−q) charges.
∴ Force on y axis adds up
F
y
=
(
3
a
)
2
k(q)(q)
+
(
3
a
)
2
k(q)(q)
×cos60
0
×2
F
y
=
a
2
3kq
2
+
a
2
3kq
2
F
y
=
a
2
6kq
2
F
y
=
4a
2
πε
0
6q
2
=
2a
2
πε
0
3q
2
I think this is the answer to your question
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