Question

Magnetic flux linked with a coil is $\varphi =5t^2+2t+3$, where t is second and $\varphi$ is in weber. At time t =1 s, the value of induced emf is volt

• A. $14$
• B. $1.2$
• C. $12$
• D. $6$

Answer 1

Answer: (C)

$12$

Given, magnetic flux $\varphi =5t^2+2t+3$
The value of induced emf $\frac{d\varphi }{dt}=10t+2$
$Att=1$
The value of induced emf $\frac{d\varphi }{dt}$
$=12V$