Question

The graph shows relation between induced emf() and time (l). During which tin
period there is no change in induced electromotive force ?​

Answer 1

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Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil.

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Answer 2

Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. ... The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil.