A) the declination varies between \[{{11.3}^{\operatorname{o}}}\] W to \[{{11.3}^{\operatorname{o}}}\] E.
B) the least declination is \[{{0}^{\operatorname{o}}}\].
C) the plane defined by dipole axis and Earth axis passes through Greenwich.
D) declination averaged over Earth must be always negative.
Correct Answer: A
Solution :
Option [a] is correct. |
Explanation: The magnetic field lines of the Earth resemble that of a hypothetical magnetic dipole located at the centre of the Earth. |
The axis of the dipole does not coincide with the axis of rotation of the Earth and it is tilted at some angle (angle of declination). |
In this situation, the angle of declination is approximately \[{{11.3}^{\operatorname{o}}}\] with respect to the later. |
So, there is two possibilities arises as shown: |
So that the declination varies between \[{{11.3}^{\operatorname{o}}}\] W to \[{{11.3}^{\operatorname{o}}}\] E. |
You need to login to perform this action.
You will be redirected in
3 sec