29. The dip at earth?s poles
(A) can only be 0
(B) cannot be less than 90
(C) can only be 90
(D) cannot be greater than 90
(E) varies between 0°and 90°since the earth rotates about its axis
Ans is given E bt i think it will be A rates assured

the range of dip is from -90 degrees (at the North Magnetic Pole) to +90 degrees (at the South Magnetic Pole). Contour lines along which the dip measured at the Earth's surface is equal are referred to as isoclinic lines. The locus of the points having zero dip is called the magnetic equator