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  4. The flux linked with a circuit is given by φ=t3+3t-7. The graph between time (x - axis) and induced emf (y - axis) will be :

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Q. The flux linked with a circuit is given by $\phi=t^{3}+3t-7.$ The graph between time $\left(x - axis\right)$ and induced emf $\left(y - axis\right)$ will be :

NTA AbhyasNTA Abhyas 2020

Solution:

$\phi=t^{3}+3t-7$
$e=-\frac{d \phi}{d t}=-\left(3 t^{2} + 3\right)$
$e$ v/s graph : $y=-3x^{2}-3,$ this is parabola, not through origin.