MAGNETOSTRICTION EFFECT -- PRODUCTION OF ULTRASONIC WAVES
When a rod of ferromagnetic material is kept in magnetic field parallel to its length the rod suffer a change in its length. The change in length is independent of the direction of magnetic field. This phenomenon is known as Magnetostriction.
If the magnetic field is alternating and has frequency equal to the natural frequency of the rod, a large amplitude longitudinal vibration can be set up. The frequency of Oscillation is ...
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