Question

The place where the angle of dip is 90 are known as

• A. Geographical poles of the earth
• B. Magnetic equator
• C. Magnetic poles of the earth
• D. None of the above

Answer 1

The correct option is C Magnetic poles of the earth

Angle of dip at a point on earth is the angle between earth's magnetic field at given point and the horizontal line of magnetic meridian.

Since the magnetic lines of force emerge and terminate at the poles of Earth, the magnetic lines of force at the poles are perpendicular to the surface there. Hence the angle of dip is ${90}^{\circ }$.