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Explanation:
F net
=2Fcosθ=2 ( a 2 +y 2 ) 2
k⋅q⋅q/2 ⋅ a 2 +y 2
y = (a 2 +y 2 ) 3/2 kq 2 y
As y<<a we writeF net = (a 3 )kq 2 y i.e. F∝y
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