Q. An alternating current i in an inductance coil varies with time according to the graph given below. Which one of the following graphs gives the variation of voltage with time?

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An alternating current i in an inductance coil varies with time according to the graph given below. Which one of the following graphs gives the variation of voltage with time?

Solution:

When the current increases the emf induced is $ V=+Lfrac{di}{dt}(say) $ ?…(i) When current decreases, emf induced is. $ V=-Lfrac{di}{dt} $ ?.(ii) The voltage induced changes This is shown in graph (c).