The variation of EMF with time for four types | vedclass

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(B) An alternating current $(AC)$ is defined as a current that periodically reverses its direction and changes its magnitude with time.In the given gr

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$(a), (b), (c)$ and $(d)$

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(B) An alternating current $(AC)$ is defined as a current that periodically reverses its direction and changes its magnitude with time.In the given graphs,the $EMF$ (and consequently the current) in all four cases $(a), (b), (c),$ and $(d)$ crosses the time axis,meaning the $EMF$ changes its polarity (sign) periodically.Since the polarity of the $EMF$ changes in all four graphs,all of them represent alternating $EMF$ or $AC$ waveforms.Therefore,the correct option is $(b)$.

The variation of $EMF$ with time for four types of generators is shown in the figures. Which amongst them can be called $AC$?

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