A Wire of Radius R Carries a Current I

question 18

Multiple Choice

A wire of radius R carries a current I.The current density is given by the function J = J₀ (1 - r/R) where r is measured from the center of the wire and J₀ is a constant.Use Ampère's law to find the magnetic field inside the wire at a distance r < R from the axis.What is the magnitude of B if I = 1A,R = 1.5 mm,and r = 1 mm?

• A)12 mT
• B)37 µT
• C)1.5 T
• D)45 mT
• E)148 µT

---

Definitions:

Educational Practices

Methods and strategies employed in teaching and learning, often based on theories and research on best practices in education.

Nonschooled Children

Refers to children who do not attend formal educational institutions, often due to lack of access, resources, or alternative educational choices by their families.

Meaningful Setting

A meaningful setting refers to an environment or context that holds significance for the individual, often enhancing their ability to learn, remember, and apply information effectively.

Preoperational Thought

A stage in Piaget's theory of cognitive development where children from about 2 to 7 years old demonstrate symbolic thinking but not yet logical operations.