Answer Posted / mohd shahid

See V/F= flux
Now Case I : Voltage is constant

if we increase the frequency thn flux will increase which
ultimately increases the hysteriss loss so in order to
dessipate the loss we hav to increase the transformer size.

NOW Case II: Flux is constant

In this case also size of transformer will increase with
increase in frequency bcoz voltage will increase in order
to maintain the constant flux. Hence more insulation will
be reqd so size ultimately increases.

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