L4 : Oersted Experiment - Magnetic Effects of Current, Science, class 10 Video Lecture

hello friends this video on magnetic
effects of current part fold is brought
to you by exam furor calm no more fear
from exam okay so get this we have got
some idea or some basic idea about
magnets and magnetic field now with
these ideas in mind we can now start
with magnetic effects of electric light
so basically now we are actually
starting with the main topic of this
lesson so what we are going to study in
magnetic effects of electric current
here we are trying to see that current
flowing through a conductor is that
current capable of producing any kind of
magnetic effect so that is what is the
purpose of this topic and in this lesson
so for that we will talk about the
experiment which was performed by a
scientist named roasted long back he
tried to establish some sort of
relationship between electricity and
magnetism so let us look at the
experiment which he had performed so let
us look at the experiment in detail so
till now
I mean before this hosted experiment was
performed electricity and magnetism both
were studied at two different subjects
or I mean there was no relation between
the two in electricity we talked about
electric current the electric charges
and all those stuff that means whenever
we spoke about electricity let's talk
about current flowing through a while
yet we talked about electric circuits
resistances and all those stuff when we
when I talked about magnetism we talked
about the properties of magnets that
materials getting attracted towards the
magnet when they are placed in magnetic
field and again all all such kind of
stuffs but ørsted was the one who first
observed that there was an inter
relation between electricity and
magnetism that is electricity and
magnetism these two branches were very
closely related to each other now how
did he observe this so let us have a
look at that so what did oars to do he
took a circuit he took a simple circuit
when he
had a source like a battery connected to
the circuit such that electric current
flows through the circuit and he took a
magnetic compass needle and he pleased
this compass needle near the circuit
what did you observe he observed that
magnetic compass needle deflected when
current passes through the wire so now
as current passed through this wire
because of the current which is fastened
to the wire
this magnetic needle showed some
deflection so now what he did he took
the same magnetic needle and he took it
away from this wire instead of whipping
the needle here
he took the needle somewhere here what
did you observe that the deflection
decreased I mean if even if the amount
of current remains the same for the same
amount of current when you place the
needle here and run in place than even
here what did you observe that the
deflection is more here and the
deflection is less here so that means
nearer the needle more is the deflection
okay so that was one thing which you
observe it gave me observed that as he
buried the amount of current through
this circuit when he increased the
amount of current through the circuit
the deflection increased similarly when
he decreased the amount of current in
the circuit the deflection decreased so
he observed that the deflection of the
magnetic needle was dependent on two
things one is the amount of current
flowing through the circuit and the
second was the distance of the needle
from this current carrying circuit so
that means and when does a magnetic
needle show deflection a magnetic needle
will show a deflection wherever you
place it in magnetic field like
otherwise it will not show any
deflection so Cho's deflection when you
place it in magnetic field so that means
there was a magnetic field which was
created somewhere around this current
carrying conductor however there is if
you look at it there is no magnet which
is present here right there is only a
current carrying wire so from this he
concluded that a wire carrying electric
current behaves like
magnet so this statement itself
connected electricity and magnetism very
close to each other that means a wire
guiding electric current which is a part
of electricity it behaves like a magnet
that is a part of magnetism so
electricity and magnetism got related to
each other very closely so this was a
very simple experiment performed by
Austin right he took a circuit when
electric current was flowing and then he
took a magnetic compass needle and saw
that it showed deflection he changed its
distance he showed he found that the
deflection valid similarly increased or
decreased the amount of current and
again found that the deflection value so
with this he concluded that a wire
carrying electric current behaves like a
magnet and he also observed that the
deflection reverses as the direction of
current is reversed so that means if you
now connect the battery in the opposite
way such that current flows like this in
the circuit so if current flows like
this then the deflection will also get
reversed so that means current and the
deflection was varying in a similar way
as current was doing so so what was the
conclusion of hosted experiment the
conclusion was a wire carrying electric
current behaves like a magnet or in
other words moving charges produce a
magnetic field in the surrounding region
moving charges is nothing but current
moving charges constitute
current so moving charges produce a
magnetic field in the surrounding region
right so that means if you have a wire
which is carrying some current I so the
region around this wire will have
magnetic field so this wire is
equivalent to a magnet right so this
Oersted experiment was a very important
or a very significant achievement
because this led to a vast growth of
this subject of electricity and
magnetism
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