AP EAMCET Engineering 22 Apr 2019 Shift 2 Paper

A Toroid has a non-ferromagnetic core of inner radius 20.5 cm and outer radius 21.5 cm. around which 4200 turns of a wire are wound. If the current in the wire is 10 A. the magnetic field inside the core of the toroid is
(µ0 = 4π × 10~7Hm−1)