The magnetic flux linked with the coil varies with time as \[\text{o }\!\!|\!\!\text{ =3}{{\text{t}}^{2}}+4t+9.\] The magnitude of the induced emf at 2 s is
A) 9V
B) 16V
C) 3V
D) 4V
Correct Answer:
B
Solution :
\[e=\frac{d\text{o }\!\!|\!\!\text{ }}{dt}=6t+4+0\] At \[t=2s,\,e=6\times 2+4=16\,V\]