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Physics help

I have a circuit question and would like someone to correct me if wrong please, the link showing the question and diagram is https://pasteboard.co/H1Rxm1h.png and the length of AB is 1m.

Am I right working the resistance of the platinum as 0.44/R=1/224 and then simply using p=RA/L

thanks.
does anyone have access to the ocr modelling physics paper 2017? or an unofficial mark scheme

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