Question

Q4. Refer to the figure below Show that the magnetic field B along the axis of a circular current loop a distance b from the axis of the loop is given as B=(µ_0 ⅈ)/2 a^2/((a^2+b^2 )^3/2) Hint Start from Biot and Savart law dB=(µo iⅆL ⃗ x r ̂)/(r^2)