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A rectangular block of metal of resistiv...

A rectangular block of metal of resistivity `p` has dimensions `d xx 2d xx 3d`. A potential difference `V` is applied between two opposite faces of the block.
(a) To which two faces of the block should the potential difference `V` be applied to give the maximum current density? What is the maximum current density?
(b) To which two faces of the block should the potential difference `V` be applied to give the maximum current? What is this maximum current?

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