with the axis of Earth. At
Mumbai, declination is nearly zero. Then,
the declination varies between W
to
E
the least declination is 0°
the plane defined by dipole axis and Earth
axis passes through Greenwich
declination averaged over Earth must be always-negative
Answer:
(a)Since the axis of
the magnetic dipole placed at the centre of earth makes an angle 
with the axis of earth, two
possibilities arises as shown in Fig. 3(EP).12 and 3(EP).13. Hence the declination
varies betweenW to E.
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