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Consider a proton and coordinate system immersed in an upward pointing external B-field.

If the orbital magnetic number m (sub l) is a positive hbar then the vector precesses counter-clockwise about the positive z axis.

1. If m (sub l) is a negative hbar then does the vector precess clockwise around the negative z-axis?

2. What about when m (sub l) has a vector length of sqrt 6 and a 0 hbar orientation. Which direction does the vector precess?

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# Direction of vector precession

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