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Two pendulums start oscillating in the s...

Two pendulums start oscillating in the same direction at the same time. Their time periods are 2 s and 1.5 s respectively , then the phase difference between them when the smaller pendulum has completed one vibration , will be

A

`pi /4 `

B

`2 pi/3`

C

`pi/2`

D

`3 pi /2`

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