Question

What is change in magnetic flux produced in coil in 100s if the induced emf in the coil is 4mV ? *
2 points​

Answer 1

We know that the rate of change in flux is equal to the e.m.f produced.

⇒ ϵ=  

∂t

∂ϕ

​

 

⇒ ϵ=  

∂t

∂(6t  

2

−5t+1)

​

=12t−5

at t=0.5s,  ϵ=12×0.5−5=1V

So, Induced current =  

R

V

​

=  

10

1

​

A=0.1A

Therefore B is correct option.