A Wire of Radius R Carries a Current I

question 40

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.What is the value of J₀ if I = 1A,R = 1.5 mm (in A/m²) ?

• A)3.18 * 10^-1
• B)4.76 * 10³
• C)1.06 * 10⁵
• D)4.24 * 10⁵
• E)2.12 * 10⁵