Resistance and Resistivity: When a 1.0-m length of metal wire is connected to a 1.5-V battery, a current of 8.0 mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 ? ? m.
A. 12 ?m
B. 6.0 ?m
C. 24 ?m
D. 2.2 ?m
Answer: A
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