- #1
hidemi
- 208
- 36
- Homework Statement
- The magnetic field at any point in the xy plane is given by B vector = A r vector times K, where r vector is the position vector of the point, A is a constant, and K is a unit vector in the +z direction. The net current through a circle of radius R, in the xy plane and centered at the origin is given by:
A) π AR^2/μ0
B) 2 π AR/μ0
C) 4 π AR^3/3μ0
D) 2 π AR^2/μ0
E) π AR^2/2μ0
Ans : D
- Relevant Equations
- ∮ B * dl =μ0 * I
Here's what I did:
∮ B * dl =μ0 * I
∮ AR * 2π*R =μ0 * I
∮ 2π*AR^2 / μ0 = I
∮ 2π*AR^3 / 3μ0 = I
Where did I do wrong?
∮ B * dl =μ0 * I
∮ AR * 2π*R =μ0 * I
∮ 2π*AR^2 / μ0 = I
∮ 2π*AR^3 / 3μ0 = I
Where did I do wrong?