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Physics · PYQ NEET UG 2019(2)

हिन्दी

The variation of e.m.f. with time for four types of generators are shown in the figures. Which amongst them can be called AC?

  1. Only (a)

  2. and (d)

  3. (a), (b), (c), (d)

  4. (a) and (b)

Correct answer · Option 2

and (d)

Explanation

Alternating current (AC) periodically reverses its direction and changes its magnitude with time, which is represented by graph (a) (sinusoidal) and graph (d) (triangular/bidirectional periodic wave). Both alternate in polarity.

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