Four point masses are arranged at the four corners of a square of side length 1. Field due to masses at the centre of square is
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Explanation:
E=
r
2
Gm
E
net
′
=2
2
E=
r
2
2
2
Gm
E
net
′
=
(9E)
2
+E
2
=
10
E
=
r
2
10
Gm
E
net
′
>E
net
Potential in both cases is
V
net
=−
r
G
(m+2m+3m+4m)
=−
r
10Gm
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