Precession Frequency of simple gyroscope

1. Jul 22, 2013

unscientific

To summarize:

1. The solenoid is supplied with an AC voltage.

2. Produces an AC magnetic field out of the page

3. Exerts an AC magnetic force on the Nb-Plate that's placed just outside of one end of the solenoid

4. There is a fluid circulating in the torus, with angular momentum L in the z-direction (out of the page)

5. What is the torque exerted on L due to the oscillating Nb-plate which forces the torus to oscillate with it?

Directions: ∅ (Left-right), θ (In-Out of page)

I'm not sure how they got an extra θ0 term in their torque about ∅. I know in small oscillations, the magnitude of change in L is

ΔL ≈ θ0L

which occurs within half a period = T/2:

ΔL/Δt = 2θ0L/T = 2fθ0L

which also doesn't match their expression..

Last edited: Jul 22, 2013
2. Jul 23, 2013

unscientific

I have shifted this to the 'Classical Physics' part of the forum. Admin please delete this post if you wish.

Last edited: Jul 23, 2013