3 charges of magnitude +q, +q, -2q is placed at the corners A,B,C of an equilateral triangle .Find out the force on the charge at point A due to other charges of the system and also its direction.sides of triangle are r ..
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here is the answer..
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Answer:
Work done in placing first charge at one of the corners=0(no other charge present)
Work done in placing second charge at the other corner=
4πϵ
0
1
r
12
q
1
q
2
Work done in placing third charge=
4πϵ
0
1
r
13
q
1
q
3
+
4πϵ
0
1
r
23
q
2
q
3
Thus the total work done=
4πϵ
0
1
r
12
q
1
q
2
+
4πϵ
0
1
r
13
q
1
q
3
+
4πϵ
0
1
r
23
q
2
q
3
=27J
Hence correct answer is option C.
Explanation:
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