Answer / utkarsh agarwal

according to the data flux density is constant.
Pe1=f1^2 Ph1=f1
Pe2=f2^2 Ph2=f2

takinf f1=25hz
f2=50 hz
Pe1/Pe2=1/4
Ph1/Ph2=1/2

now iron loss Pi=Ph1+Pe1
Therefoe
1. ph1 + pe1=250
2. 2ph1+ 4pe1=800
solving we get ph2= 200w

P.S. : "=" is meant to be proportiaonality sign in first 3 lines

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