Question
Define the term magnetic inclination. Deduce the relation connecting the horizontal component and inclination with the help of a diagram.
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Answer
Magnetic Inclination: It is the angle made by resultant magnetic field of earth with the horizontal. It is also called angle of dip. Relation: suppose $\overrightarrow{\text{Be}}$ is earth’s net magnetic field, $\theta$ is angle of dip. Resolving $\overrightarrow{\text{Be}}$ along horizontal and vertical directions; the horizontal component is H and vertical component is V. From fig. $\therefore\text{ H=Be}\cos\theta$ This is the required relation.
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