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Physics
Physics
Problem
The corners
A
,
B
,
C
A, B, C
A
,
B
,
C
, and
D
D
D
of a square are occupied by charges
q
,
−
q
,
2
Q
q, -q, 2Q
q
,
−
q
,
2
Q
, and
Q
Q
Q
, respectively. The side of square is
2
b
2b
2
b
. The field at the midpoint of side
C
D
CD
C
D
is zero. What is the value of
q
/
Q
q/Q
q
/
Q
? (1)
5
5
/
2
5\sqrt{5}/2
5
5
/2
(2)
2
2
/
5
2\sqrt{2}/5
2
2
/5
(3)
2
/
5
2/5
2/5
(4)
5
/
2
5/2
5/2
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