let us study another important law in electro
magnetic induction that is lenz law. to understand
lenz law 1st let’s discuss some facts about
electro magnetic induction. we’ve already
studied in previous sections that, by electro
magnetic induction, a mechanical energy, transforms,
into electro magnetic energy. as we know electro
magnetic induction takes place whenever there’s
a relative motion between magnetic field and,
a conductor or a coil. however the relative
motion may exist because of some other electrical
energy so here we can write, mechanical or
electrical energy, relative motion may be
because of electrical energy also, it transforms
into electro magnetic energy. and this electro
magnetic energy is depicting here the e m
f which is induced. now we know that whenever,
there is transformation of energy, always,
whenever there exist a transformation of energy
from 1 form to another, always some, positive
and negative work, is done, by respective
forces. that means positive work is done by,
the type of force which is supplying energy,
negative work is force which is gaining energy
because negative work implies the gain of
energy, into a different form. so here we
can say always some positive or negative work
is done, negative work implies the force which
is, opposing the process, from which the gain
of energy is their. that means in case of
electro magnetic induction, always, their
exist, some force or forces, which oppose,
the causes of electro magnetic induction,
causes are the forces which are causing the
relative motion or which are supplying energy.
causes of electro magnetic induction or, supplying,
energy forces this we can say these may be
electrical or mechanical forces. based on
this fact only lenz law is defined, if we
talk about, the lenz law statement, it is
just a consequence of energy conservation,
it states that, in electro magnetic induction,
always, e m f is induced, in such a way or
in such a direction that, the effects of,
this induced e m f, always oppose, the causes
of, electo magnetic induction, that is the
causes of, change in, magnetic flux because
the basic cause, via electro magnetic induction
is taking place is the change in magnetic
flux. so lenz law states that in electro magnetic
induction always the effects of this e m f,
oppose the causes of change in magnetic flux
or the causes of electro magnetic induction.
this law itself is going to become a strong
basis for different kind of problems in analyzing
the direction of induced e m f or induced
current.
