Question
The angle of dip at the poles and the equator respectively are
30o, 60o
0o, 90o
45o, 90o
90o, 0o
Solution
D.
90o, 0o
Since the angle of dip at a place is defined as the angle δ, which is the direction of the total intensity of earth's magnetic field B makes with Z horizontal line in magnetic meridian,
At poles
B = Bv
and B = B sinδ
∴ sinδ = 1
⇒ δ = 90o
At equator
B = BH
and BH = B cosδ
∴ cosδ = 1
⇒ δ = 0o
Angle of dip at the two poles is 90o. On the magnetic equator, the angle of dip is 0o as the needle would rest horizontally at the magnetic equator. At other places the value of dip angle lies between 0o to 90o.
