Question

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°
• C. 60°
• D. 90°

Answer 1

Answer: (D)

90°

Answer 2

Magnetic meridian is a vertical N-S plane, the earth’s magnetic field $\left( B _ { H } \right)$ lies in it. (For more details see magnetism).

To obtain neutral point at the centre of coil, magnetic field due to current (2) and $B _ { H }$ must cancel each other. Hence plane of the coil and magnetic meridian must be perpendicular to each other as shown