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A standing wave y=2A sinkx cos omegat is...

A standing wave `y=2A sinkx cos omegat` is setup in the wire `AB` fixed at both ends by two vertical walls (see the figure). the region between the wall contains a constant magnetic field `B`. Now answer the following questions.
In the above question, the time when the emf becomes maximum for the first time is

A

`(2pi)/(omega)`

B

`(pi)/(omega)`

C

`(pi)/(2omega)`

D

`(pi)/(4omega)`

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