A stsnding wave y = 2A sin kx cos omegat...

A stsnding wave `y = 2A sin kx cos omegat` is set up in the wire `AB` fixed at both ends by two vertical walls (see Fig. 3.197). The region between the walls contains a constant magnetic field `B`. Now answer the following question:

In which of the following modes the emf induced in `AB` is always zero?

Fundamental mode

second harmonic

Second overtone

Fourth overtone

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