Question

(a). The magnetic flux linked to a coil of 10 turns changes
by 40m Wb in a time of 2ms. What is the magnitude of
the induced emf produced in the coil ?
1​

Answer 1

Answer:

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.

hope this helps you

Answer 2

Faraday's Principle of Electromagnetic Induction states that the emf induced in a loop due by a changing magnetic flux is equal to the rate of change of the magnetic flux threading the loop. The magnetic flux threading a coil of wire can be changed by moving a bar magnet in and out of the coil.