Question

The magnetic flux linked with a coil varies as $\varphi =3t^2+4t+9$. The magnitude of the emf induced at $t=2$ seconds is?

• A. $8$ V
• B. $16$ V
• C. $32$ V
• D. $64$ V

Answer 1

The correct option is B $16$ V

$\varphi =\frac{d\theta }{dt}$

$=6t+4=6\left(2\right)+4$

$=16V$.