Two particles are executing simple harmonic motion of the same amplitude $A$ and frequency $\omega $ along the $x-$ axis. Their mean position is separated by distance $X_0 (X_0> A)$. If the maximum separation between them is $(X_0 +A)$, the phase difference between their motion is
A$\frac{\pi }{6}$
B$\frac{\pi }{2}$
C$\frac{\pi }{3}$
D$\frac{\pi }{4}$
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B$\frac{\pi }{2}$
b At extreme position, phase difference $=\frac{\pi }{2}$
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