Answer to Question #48178 in Electricity and Magnetism for ashwani

Question

is back emf induced in secondary coil of transformer?

Answer 1

Answer
Yes. In this case the magnetic fieldproduced by one coil (the ‘primary coil’) passes through a second coil (the
‘secondary coil’). If the field produced by the primary coil changes, an emf is
induced in the secondary coil. But a changing magnetic flux produces a varying
current through the coil which itself will produce its own magnetic field. This
self-induced emf opposes the change that is causing it and the faster the rate
of change of current the greater is the opposing emf. This self-induced emf
will, by Lenz’s law oppose the change in current in the coil and because of its
direction this self-induced emf is generally called a back-emf.