Rotation of current-carrying loop in B Field
This physlet illustrates the motion of
a current-carrying loop in an external magnetic field.
We are seeing the loop "edge-on",
so there is the straight piece and two "circles" on the end
to indicate the wires that point perpendicular to the screen. If the
current in the end wires is coming OUT, it will have a DOT WITHIN A
CIRCLE (like the tip of an arrow). If the current is going IN, then
there is an X (like the tail of an arrow). The force vectors are also
shown (the magnetic force on the current-carrying wire, from the
You can change the strength of the
magnetic field, and the direction of the field (Positive B = EAST,
Negative B = WEST). You can change the magnitude of the current, and
the direction of the current (the direction is indicated by what the
GREEN wire shows .. POSITIVE current means OUT for the green wire ..
NEGATIVE means IN). You can also change the intial angle - this is the
angle that the magnetic moment makes with the Magnetic field.
(Wouldn't it be great to be able to see the magnetic moment
vector as it rotates ... hoo boy, yeah, that would be sweet, but I
can't figure out how to do that! It's because of the way I'm doing the
animation .. I don't have access to the "orientation" of the
coil as it moves.)