A toroid with thick windings of N turns has inner and outer radii R₁ and R₂ , respectively. If it carries certain steady current I , the variation of the magnetic field due to the toroid with radial distance is correctly graphed in

Step-by-step solution

Magnetic field due to toroid can be given as (i) In the open space, cxtcrior of a toroid, B=0 (ii) Inside the toroid, B= ₀ N I 2 r Here, r= R₁+R₂ 2 B= ₀ N I (R₁+R₂ ) = constant So, the variations of B with r is correctly depicted in option (d). in option (d).