Iron Has Two Conductance Electrons in Its Outer Orbital Shell

question 17

Multiple Choice

Iron has two conductance electrons in its outer orbital shell. Its mass density is 7.87 g/cm³, and the molar mass is 55.85 g/mol. What is the drift velocity when a voltage of 12 V is applied across a 2.0 m length of iron wire?

• A)0.1 mm/s
• B)0.7 mm/s
• C)1.4 mm/s
• D)2.2 mm/s