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Two identical point charges, each with charge
+q, are fixed in space and separated by a
distance "d". A third point charge -Q of mass
"m"
It can move freely and is initially at rest on the
x-axis at a distance "x"
+q
d/2
0
d/2
+q
-Q
X
Prove that for very small "x" (x<<d), the
movement of -Q is simple harmonic to
along the x-axis. Find the period of the small
oscillations.

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