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Question

Two particles of P and Q describe S.H.M of same amplitude a, frequency υ along the same straight line. The maximum distance between the two particles is a2. What is the initial phase difference between the particles?

A
zero
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B
π2
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C
π6
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D
π3
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Solution

The correct option is B π2
Let the equation of motion of the two particles be
y1=a sin 2πnt
y2=a sin (2πnt+ϕ)
where ϕ is the phase difference
y=y2y1=a[sin (2πnt+ϕ) -sln 2πnt]
=2asinϕ2cos(2πnt+ϕ2)
Maximum value of y = 2a sin ϕ2
..2a sin ϕ2=a2 or sin ϕ2=12
..ϕ=π2

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