| 31. | When the external field is removed, the remanent magnetization can recover to a value close to its original.
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| 32. | Unfortunately, the small magnitudes of nuclear magnetic dipoles also makes them less inclined to align to external fields.
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| 33. | A permanent magnet in such a field will rotate so as to maintain its alignment with the external field.
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| 34. | The Ramsey Bord?interferometer provides the potential for improved frequency measurements in the presence of external fields or rotations.
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| 35. | Active current feedback may also be employed, such that the sense winding is driven to counteract the external field.
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| 36. | For alkynes the most effective orientation is the external field in parallel with electrons circulation around the triple bond.
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| 37. | Specifically, an excited atom will act like a small electric dipole which will oscillate with the external field provided.
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| 38. | On the other hand, the direction of current induced by external fields is only dependent on the direction of winding.
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| 39. | The associated electronics use this fact to create a signal exactly at the frequency that corresponds to the external field.
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| 40. | This helps to counter inherent non-linearity between the applied external field strength and the flux gated through the sense winding.
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