some wire of cross-sectional area 1mm2 has a


Some wire of cross-sectional area 1mm2 has a resistance of 20 ?. Determine

(a) the resistance of a wire of the same length and material if the cross-sectional area is 4mm2,and

(b) the cross-sectional area of a wire of the same length and material if the resistance is 32?.

 

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Physics: some wire of cross-sectional area 1mm2 has a
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