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Physics
Physics
Problem
Four identical positive point charges
+
q
+q
+
q
are fixed at the four corners of a square of side
a
a
a
. What is the magnitude of the electric field at the centre of the square? a)
2
2
k
q
a
2
2\sqrt{2}\dfrac{kq}{a^{2}}
2
2
a
2
k
q
b) 0 c)
8
k
q
a
2
8\dfrac{kq}{a^{2}}
8
a
2
k
q
d)
4
k
q
a
2
4\dfrac{kq}{a^{2}}
4
a
2
k
q
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