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

Options

A. 9 V
B. 16 V
C. 3 V
D. 4 V

Answer

B

Explanation

`e = ( d phi )/( dt) = 6 t + 4 + 0`
`At t = 2s, e = 6 xx 2 + 4 = 16 V`