The magnetic flux linked with a coil varies as `phi=3t^(2)+4t+9.` Find the magnitude of the emf induced at t = 2S.

The magnetic flux linked with the coil varies with time as phi = 3 t^2 + 4t + 9 . The magnitude of induced emf at t = 2 second is

The magnetic flux linked with a coil varies with time as phi=3t^(2)+4t+9 webers. The induced emf at t=2s is

The magnetic flux linked with a coil is phi = (3 t^(2) - 2 t + 1) milliweber. The e.m.f. induced in the coil at t = 1 sec is

The magnetic flux in a coil is phi = 4t^2 + 4t + 4 . What is the magnitude of induced e.m.f. at t = 3sec?