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Yes, and write the differential equation for x-xe.

ehild

We have two equations ,You should have expand around the equilibrium.

ehild

k

_{e}q

^{2}/x

_{e}

^{2}= k(x

_{e}-L)

$$\mu \frac{d^2 x}{dt^2} = -kx + k_e\frac{q^2}{(x+L)^2}$$

Here x

_{e}is equilibrium separation and x is the extension from the equilibrium length ,but what is the relationship between the two ?

Should I substitute the value of L from first equation into the second .

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