Magnetic field - Moving Charges & Magnetism Video Lecture - Class 12

hello friends this video on matter and
magnetism part 3 is brought to you by
exam for calm no more fear from exam
please make sure that you have watched
all the videos in part 2 before going
ahead with this one now let us talk
about talk exclusively about magnetic
field so what is a magnetic field what
are the different characteristics of
magnetic field how do we denote magnetic
field how do we find magnetic field how
I mean how will we find out the
magnitude of magnetic field or whether
it is a scalar quantity vector quantity
so we will study all about magnetic
fields special so again before I start
with magnetic fields I will start with a
comparison of electric field and
magnetic field so that you do not get
confused and every all understanding of
all the concepts should be on the same
lines you should not you should also
know how is electric field and magnetic
field related and how you understood
electrostatics similarly you should
understand magnetism right so here if
you see when we talk about electric
field this is what you visualize right
that let us suppose this is a positive
charge so your electric field lines they
all originate from the positive charge
right so it creates an electric field
around itself so in a nano charged
particle that is a negative charge
particle comes in this electric field
lines terminate in the negative charge
particle and this negative charge
experience a force towards light
experiences and attractive force towards
the positive charge particle something
like that happens so this is how we
normally represent the electric field
lines where it starts from positive
charge ends at negative charges so every
charged particle which is at rest will
produce an electric field around itself
similarly every charged particle which
is in motion will produce a magnetic
field around itself as you can see here
so that means in this magnetic field
also if some of the charged particle
enters that particle will experience a
force due to this man
right so we will study about all that
gradually so magnetic field is produced
by moving charges it is a vector field I
mean very like how we talked about your
electric field similarly in case of
magnetic field it is a vector field Y
vector field because it not only has a
magnitude but it has a direction as well
I mean in order to specify magnetic
field at a point it will have a
direction of its own so therefore it is
a vector field it is defined at each
point in space now if something if any
quantity is a vector quantity and if I
am saying that its direction changes at
every point so that means the magnetic
field at each point will be different so
if I measure magnetic field at one point
it will be different from the other
point right so it is defined at each
point in space it obeys principle of
superposition you remember the principle
of superposition which we talked about
when we study the electrons electric
field in electrostatics it means that if
you have a system such that there are
some n number of charged particles there
are multiple charged particles and those
charged particles are producing magnetic
fields they are all moving charged
particles right so let us suppose the
first charge particle produces some
magnetic field say v1 the second charge
particle produces a magnetic field
between third charged particle produces
some magnetic field V 3 and so on so
then what will be the net magnetic field
of the entire system so the net magnetic
field will be the vector sum of the
individual magnetic fields produced by
the individual charged particles so that
is the principle of superposition right
the principle of superposition tells us
that you can vectorially you vector with
you can perform vector addition on
individual vector quantities right so
this principle of superposition
basically tells us that if you have some
magnetic field B 1 B 2 B 3 which are
being produced by some charged particles
a q 1 q
to q3 I mean they are all moving only if
they are moving they can produce a
magnetic field so what would be the net
magnetic field of the system net
magnetic field will be vector addition
of the individual magnetic fields so I
hope you are clear with all these points
okay and they are all similar to your
electric field except the first one
because in case of electric field they
are produced by static charges thank you
please visit exam few calm to watch free
educational videos try free online tests
get the best quality study materials
study from the best tutors and mentors
and much more thank you once again