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Three progressive waves A,B and C are sh...

Three progressive waves `A,B` and `C` are shown in figure. With respect to wave `A`
.

A

The wave C is ahead by a phase angle of `pi//2` and the wave B lags behicnd by a phase angle of `pi//2`

B

The wave C lags behind by a pahse angle of `pi//2` and the wave B is ahead by a phase angle of `pi//2`

C

The wave C is ahead by a phase angle of `pi` and the wave B lags behind by a phase angle of `pi`

D

The wave C lags behind by a phase angle of `pi` and the wave B ahead by a phase angle of `pi`

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The correct Answer is:
b
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