Apparatus:
Base
with
coils,
2
core
extensions,
3
solid
metal
rings,
1
metal
ring
with
a
slot
in
it,
liquid
N2
and
tongs.
Description:
Plug
in
the
base
to
a
wall
outlet.
Put
rings
around
the
core
of
the
coil,
and
flip
a
switch.
One
of
the
2
switches
toggles
between
one
and
2
coils,
the
other
is
power.
The
solid
rings
will
jump
as
eddy
current
is
induced,
the
split
ring
will
not
budge.
The
core
extensions,
when
stacked
one
atop
the
other
on
the
core,
extend
the
magnetic
field,
which
results
in
the
rings
jumping
higher.
The
rings
will
almost
reach
the
ceiling
if
they
are
cooled
in
liquid
nitrogen.
When
doing
this,
be
careful.
The
metal
rings
are
quite
cold.