A) The wave C is ahead by a phase angle of p/2 and the wave B lags behind by a phase angle of p /2
B) The wave C lags behind by a phase angle of p/2 and the wave B is ahead by a phase angle of p /2
C) The wave C is ahead by a phase angle of p and the wave B lags behind by a phase angle of p
D) The wave C lags behind by a phase angle of p and the wave B ahead by a phase angle of p
Correct Answer: B
Solution :
Equation of A, B, C and D are \[{{y}_{A}}=A\sin \omega t\], \[{{y}_{B}}=A\sin (\omega t+\pi /2)\] \[{{y}_{C}}=A\sin (\omega t-\pi /2)\], \[{{y}_{D}}=A\sin (\omega t-\pi )\] It is clear that wave C lags behind by a phase angle of \[\pi /2\] and the wave B is ahead by a phase angle at \[\pi /2\].
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