Question

A conducting loop is placed in a magnetic field. What must be true for there to be a current induced in the loop? (1 point) There must be a source of charge The magnetic field must be changing Potential energy must change into kinetic energy The loop must be surrounded by insulating material

Answer 1

Answer:

EMF will induce in the conducting loop when

The magnetic field must be changing

Explanation:

As per Farady's law of EMI we know that the magnetic flux linked with the closed conducting loop must be changed with time

so we have

$EMF = \frac{d\phi}{dt}$

so we know that

$\phi = BAcos\omega t$

now if magnetic field is changing with time then we have

$EMF = Acos\theta \frac{dB}{dt}$

so EMF will induce when magnetic field will change with time