The flux of magnetic field through a closed conducting loop changes with time according to the equation `phi= 0.2t^(2) + 0.4t + 0.6`. Find the induced e.m.f at t= 2s.

Explanation

`phi= 0.2t^(2) + 0.4t + 0.6`
`e= - (d phi)/(dt) rArr e= - 0.4t- 0.4`
when `t= 2s, e= -0.8 - 0.4 = - 1.2V`