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A wire has a length of and is made of metal of resistivity . A potential difference (p.d.) of is applied across the wire so that it has a current of . What is the cross-sectional area of the wire?
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and is made of metal of resistivity 
. A potential difference (p.d.) of 
is applied across the wire so that it has a current of 
. What is the cross-sectional area of the wire?
