Question

# The earth's magnetic field

A
varies in direction but not in magnitude
B
varies in magnitude but not in direction
C
varies in both magnitude and direction
D
is centred exactly about the centre of the earth
Solution
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#### The magnetic field around the earth is like that around the bar magnet as shown. The magnetic lines of force emerge from geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnetic and direction at all points. 0
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