Q. A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is
A) 0
B) 45${^\circ}$
C) 60${^\circ}$
D) 90${^\circ}$
Explanation
(d) Magnetic meridian is a vertical $N$-$S$ plane, the earth’s magnetic field $(B_{H})$ lies in it. (For more details see magnetism)
To obtain neutral point at the centre of coil, magnetic field due to current $(B)$ and $B_{H}$ must cancel each other. Hence plane of the coil and magnetic meridian must be perpendicular to each other as shown
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.