An element $d\vec l= dx\hat i$ (where $dx = 1$ cm) is placed at the origin and carries a large current $I = 10A$. What is the magnetic field on the y-axis at a distance of 0.5 m?

$4×10^{-8}\hat kT$

$\text{Using Right hand thumb rule direction of Magnetic Field is along Z axis}$

$\text{Its Magnitude is } B = \frac{\mu_0 I dl sin\theta}{2\pi y^2}$

$\theta = 90^o$

$B = 4\times 10^{-8} \hat{k}T$