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50. From Eq. 2937 (see also Eq. 2936) we write the torque as
τ
=
−µ
B
h
sin
θ
where the
minus indicates that the torque opposes the angular displacement
θ
(which we will
assume is small and in radians).
The small angle approximation leads to
h
B
µθ
≈−
,
which is an indicator for simple harmonic motion (see section 165,
especially Eq. 1622).
Comparing with Eq. 1623, we then find the period of oscillation
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 Spring '08
 Any
 Physics

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