An open circuit test is performed on $50$ $Hz$ transformer, using variable frequency source and keeping $V/f$ ratio constant, to separate its eddy current and hysteresis losses. The variation of core loss/frequency as function of frequency is shown in the figure

The hysteresis and eddy current losses of the transformer at $25$ $Hz$ respectively are

1. $250$ $W$ and $2.5$ $W$
2. $250$ $W$ and $62.5$ $W$
3. $312.5$ $W$ and $62.5$ $W$
4. $312.5$ $W$ and $250$ $W$

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