Resistance and Resistivity: A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. How much current is flowing in the tube, if the radius of the tube is 0.495 mm?
A. 18 A
B. 180 A
C. 29 A
D. 280 A
Answer: A
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