Question

Use Empers circuital law for the Magnetic field around the axis of toroid​

Answer 1

Explanation:

Magnetic field due to a toroidal solenoid: A long solenoid shaped in the form of closed ring is called a toroidal solenoid (or endless solenoid). Let n be the number of turns per unit length of toroid and I the current flowing through it. The current causes the magnetic field inside the turns of the solenoid. The magnetic lines of force inside the toroid are in the form of concentric circles. By symmetry the magnetic field has the same magnitude at each point of circle and is along the tangent at every point on the circle. For points inside the core of toroid Consider a circle of radius r in the region enclosed by turns of toroid. Now we apply Ampere’s circuital law to this circular path, i. e.,   Length of toroid = 2πr Number of turns in toroid = n(2πr)  current in one-turn = I  ∴ Current enclosed by circular path =(n2πr) • I  ∴ Equation (1) gives Read more on Sarthaks.com - https://www.sarthaks.com/54012/using-amperes-circuital-derive-expression-magnetic-field-along-axis-toroidal-solenoid