Induced emf,e = -L\(\frac{di}{dt}\)
For 0 ≤ t ≤ \(\frac{T}{4}\),
i-t graph is a straight line with positive constant slop.
∴ \(\frac{di}{dt}\) = constant
e = -ve and constant, For 0 ≤ t ≤ \(\frac{T}{4}\)
For \(\frac{T}{4}\) ≤ t ≤ \(\frac{T}{2}\)
i is constant ∴ \(\frac{di}{dt}\) = 0
e = 0\(\frac{T}{4}\) ≤ t ≤ \(\frac{T}{2}\)
For \(\frac{T}{2}\)≤ t ≤ \(\frac{3T}{4}\)
i-t graph is a straight line with negative constant slope.
∴ \(\frac{di}{dt}\) = constant
e = +ve and constant For \(\frac{T}{2}\)≤ t ≤ \(\frac{3T}{4}\)
For\(\frac{3T}{4}\)≤ t ≤ T,
i is zero ∴ \(\frac{di}{dt}\) = 0
e = 0 For \(\frac{3T}{4}\)≤ t ≤ T
From this analysis, the variation of induced emf with time as shown in the figure below.