| 21. | Gray concrete blast barriers and coils of barbed wire are everywhere.
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| 22. | The coil rotates, compressing a spring that opposes the rotation.
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| 23. | Methods include a superconducting bucket or aluminum coil as the payload.
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| 24. | A two axis magnetic search coil antenna measured AC magnetic fields.
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| 25. | Their hyphae penetrate into the root cells and form typical coils.
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| 26. | The mirror attached to the coil frame rotates together with it.
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| 27. | The moving coil galvanometer is practically immune to ambient magnetic fields.
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| 28. | A local cable manufacturer donated the copper conductor for the coils.
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| 29. | A rotary voice coil is a rotational version of a solenoid.
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| 30. | The voice coil and the magnet form a linear electric motor.
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