Question: a conductive block in the shape of a rectangle solid has a cross - sectional area 1 2 cm ^ 2 across its width, and

a conductive block in the shape of a rectangle solid has a cross-sectional area 12cm^2 across its width, and a length of 20cm. The block has a resistance of 180 ohm. the block contains 1.1e+19 conduction electrons. connecting a battery to the two ends of the block, a potential difference

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