What do you call the angle of inclination of the axis of the magnetic needle to the horizontal plane when suspended freely ?

Angle of inclination

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Angle of variation

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Angle of declination

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None of the above

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Solution

The correct option is C Angle of inclination
Magnetic declination or magnetic variation or the angle of inclination is the angle on the horizontal plane between magnetic north (the direction in which the north end of a compass needle points, corresponding to the direction of the earth magnetic field) and true north (the direction along a meridian towards the geographic north pole).

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