A long straight wire along the -axis carries a current in the negative -direction

PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current

Problem

A long straight wire along the

Z

-axis carries a current

I

in the negative

Z

-direction. The magnetic vector field

\vec{B}

at a point having coordinates

(x, y)

in the

Z = 0

plane is [2002S] (1)

\frac{\mu_0 I (y\hat{i} - x\hat{j})}{2\pi(x^2 + y^2)}

(2)

\frac{\mu_0 I (x\hat{i} + y\hat{j})}{2\pi(x^2 + y^2)}

(3)

\frac{\mu_0 I (x\hat{j} - y\hat{i})}{2\pi(x^2 + y^2)}

(4)

\frac{\mu_0 I (x\hat{i} - y\hat{j})}{2\pi(x^2 + y^2)}