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[Phys-L] Pendulum problem



Suppose the bob of a simple pendulum (all the assumptions, small
amplitude length of bob short compared to the rod's, etc.) is a PM
(collinear w/ the rod) immersed in a uniform field. How will the
resultant torque affect the pendulum?

I have an idea *, but I'm interested in other's.

If correct, quantitative.


bc

I'll deal w/ the variations later, e.g. ferromagnetic bob, di/converging
field, etc.