Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 3M

Year: Dec 2012

Magnetostriction Effect:-

• The phenomenon in which a rod of Ferro-magnetic material undergoes a small change in length when placed in a steady magnetic field parallel to its length is called magnetostriction effect.

• The mathematical relation between change in length per unit length of the rod and Flux density is given by:-

  $\frac{∂x}{∂L} = kB^2$ Where, k is material constant

Piezoelectric Effect:-

• When a mechanical compression or tension is applied to some crystals like quartz, a potential difference is developed across the crystal which is proportional to the applied pressure. This phenomenon is known as Piezo-electric Effect.

• Also if the potential difference is applied across the crystal, a mechanical compression or tension is developed. This is called Inverse Piezo-electric Effect.