Answer / koti

Due to magnetostriction(vibration or movement of laminations by alternating wave)

Answer / vinoth a.r

when transformer get magnetized,the magnetized core get
expanding and contraction.in one power cycle two times get
expand and two time get contraction.only little dimension.
this effect called electrostriction.

Answer / sanjayjssate

it is due to magnetisation and demagnetisation of core according to friquency and voltage.

Answer / sandeep singh vyas

when magnetic flux cuts due to this reason transformer creates a sound

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