A time-varying magnetic field can be caused by fluctuating electric fields.
Answer:
-fluctuating electric fields
Explanation:
As we know that electric field and magnetic field is related by the equation given as
[tex]\int E. dl = -\frac{d\phi}{dt}[/tex]
here we know that
[tex]\phi = B.A[/tex]
now we have magnetic field is time varying
[tex]\int E.dl = -A\frac{dB}{dt}[/tex]
now for closed loop of radius "r" we will have
[tex]E(2\pi r) = - A\frac{dB}{dt}[/tex]
[tex]E = -\frac{A}{2\pi r}\frac{dB}{dt}[/tex]
so here this produce electric field as per above formula and it is also known as non conservative electric field.
