Question

A long straight wire along the Z-axis carries a current I in the negative Z-direction. The magnetic vector field vecB at a point having coordinates (x,y) in the Z=0 plane is

• A. \( \dfrac{\mu_0 I}{2\pi(x^2+y^2)}(y\hat{i}-x\hat{j}) \)
• B. \( \dfrac{\mu_0 I}{2\pi(x^2+y^2)}(x\hat{i}+y\hat{j}) \)
• C. \( \dfrac{\mu_0 I}{2\pi(x^2+y^2)}(-x\hat{i}-y\hat{j}) \)
• D. (mu₀ I)/(2π(x²+y²))(-yhati+xhatj)

Hint:

Always determine direction of magnetic field using right-hand thumb rule before writing vector form.

Answer 1

The Correct Option is A