A Copper Wire Has a Diameter of D_Cu = 0 $\varOmega$

question 32

Multiple Choice

A copper wire has a diameter of d_Cu = 0.0400 cm,is 3.00 m long,has a resistivity of 1.72 * 10^-8 $\varOmega$ m and has a carrier density of 8.50 * 10²⁸ electrons/m³.The copper wire is attached to an equal length of aluminum wire with a diameter of d_Al = 0.0200 cm,and a carrier density of 6.02 * 10²⁸ electrons/m³.A current of 0.400 A flows through the copper and aluminum wires.What is the ratio of the current densities J_Cu/J_Al in the two wires?

• A)0.25
• B)0.50
• C)2
• D)3
• E)4

---

Definitions:

Prenatal Development

The process of growth and development within the womb from conception to birth.

Parent's Age

Refers to the age of a mother or father at the birth of their child, which can influence various aspects of the child's health and upbringing.

Administrative Responsibility

The duty or obligation of managing and implementing decisions within an organization or government entity.

Interpretive Rules

Regulations issued by administrative agencies that clarify or interpret the statutory provisions they enforce or administer.