Question

Current I is flowing in a coil and two points B₁ and B₂ are on the axis of coil at a distance 0.05 m and 0.2 meter respectively. If ratio of magnetic field at point B₁ and B₂ are in 8 : 1, then find radius of coil.

(1) 0.1 m 

(2) 0.2 m 

(3) 0.7 m 

(4) 0.8 m

Comments

Magnetic effects of current and magnetism, Magnetic dipole moment

Answer 1

Ans : (1) 0.1 m