Question

(i) State Biot-Savart law in vector form expressing the magnetic field due to an element vector(dl) carrying current I at a distance vector from the element.

(ii) Write the expression for the magnitude of the magnetic field at the centre of a circular loop of radius r carrying a steady current I. Draw the field lines due to the current loop.

Answer 1

(i) According to Biot-Savart's law, the magnetic field due to a current element vector(dl) carrying current I at a point P with position vector r is given by