let us study some examples of oscillations
due to magnetic force.
now here you can see.
this is a wooden stand.
on which a straight wire is connected on the
2 vertical bars. and at the bottom of this
wooden stand.
some mercury is placed. and, a battery is
connected.
between, this mercury. and the top wire of.
the stand.
and, this connected via to.
connecting wires along with a switch. and
here you can see, there is a vertical stiff
wire which is.
hanging from the topmost wire.
via a smooth hinge. which is connected at
the hinge at the top and, the bottom end of
the wire is dipped in the mercury.
so here we can see when the switch is closed.
a current will start flowing because the circuit
is completed.
and in this situation, if we put.
an external magnetic field.
if we applying an external magnetic field
onto the situation.
in the direction parallel to the top wire
of the stand.
here we can see here we are applied the magnetic
field.
and if the switch is closed we can see clockwise
current flows in the circuit.
and in the stiff wire current flows in the
direction from top to bottom. and as magnetic
field is acting toward right.
we can see, via this righthand palm rule if
we point our fingers in magnetic field direction
and if. thumb towards the direction of current.
a magnetic force will act on the stiff wire
in inward direction due to which the wire
will start moving, about the top hinge, in
inward direction.
and as soon as it is moved, the contact.
of this wire at the bottom end with the mercury
breaks up. and the current flow is stop. and
due to gravity the wire comes back and again
as it comes in the contact with the mercury.
it experiences the magnetic force again it
goes in backward direction.
and you can see a continuous oscillation.
is started of the vertically, hinged wire
at the top most point.
it is because of magnetic force in oscillations.
are.
existing in continuation because the magnetic
force.
is applied periodically whenever the wire
come in contact with the mercury and the circuit
is completed.
and as soon as it is broken of the.
magnetic force vanishes and it comes back
in the vertical position.
and this is very good experimental project
which if we wish you can also fabricate and
demonstrate in your schools.
