Question: 3. An electron spin is in a magnetic eld E : (B' cos wt, B' sin wt, B0). At t : O the spin is

3. An electron spin is in a magnetic eld E : (B' cos wt, B' sin wt, B0). At t : O the spin is in the z direction. Determine the probability of nding the spin at If time in the z direction

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