now we’ll discuss about, the direction of
magnetic force on a current carrying wire.
as we already discussed that on a current
carrying wire magnetic force is given by,
i. l cross b. so from this expression we can
say.
that direction of.
f-m vector. can be given by.
righthand thumb rule.
by using the concept of cross product if we
rotate our fingers of righthand from l vector
to b vector thumb will give the direction
of.
magnetic force on the current carrying wire.
but other then righthand thumb rule also there
are 2 rules which are quite useful for analyzing
the magnetic force on a wire.
we can write other then.
right hand thumb rule.
direction of.
magnetic force.
on a current carrying wire.
can be given by.
1 is.
fleming’s left hand rule. and the other
one is, righthand palm rule.
right hand palm rule is, similar to, what
we already discussed about the force experience
by a, moving charge in magnetic field.
similar to that we can calculate lets discuss
both of these rule in realistic situation
on the next sheet.
so lets first discuss about fleming’s left
hand rule. and to understand this fleming
left hand rule, here we can see a situation
in which, a magnetic induction exist from
left to right which is b vector. in which
a wire x-y is placed which is of length l
and it carries a current i in upward direction.
now fleming’s lefthand rule states.
that if we just, spread our.
thumb.
index finger. and middle finger, in mutually
perpendicular directions here you can see
in this situation.
for our lefthand if we. stretch our index
finger.
middle finger and thumb in mutually perpendicular
directions. and in this situation if we point
our. index finger.
along the direction of b vector here you can
see we are pointing. and in this situation.
if we point middle finger.
along the direction of current.
and in this situation current or basically
we can write it.
positive charge flow direction.
because.
current is in the direction of positive charge
flow.
then we can say our.
thumb will give us the direction of magnetic
force.
and here in this situation you can see.
that thumb is pointing in inward direction
so in this situation the magnetic force acting
on it.
will be in inward direction.
this is one rule and other rule we can write,
that is righthand palm rule which we already
studied.
in righthand palm rule.
you know we spread our right hand palm in
such a way that, if our fingers.
are pointing in direction of b vector. and
we. keep our thumb.
in the direction of current or. it is the
positive charge flow direction.
then.
in this situation our palm face.
will give the direction of magnetic force.
this is situation here you can see.
again in this situation the direction of our
palm face here will be in downward direction,
or inward direction to the.
perpendicular to the plane of sheet this is
the way how we, analyze righthand palm rule
and fleming’s lefthand rue. here the righthand
palm rule is more useful and comfortable in
various cases so, i prefer this rule to be
used in upcoming applications.
