CBSE Class 12 · 2005 · Magnetic Properties of MatterShort Answer

Define the terms 'Magnetic Dip' and 'Magnetic Declination' with the help of relevant diagrams.

Solution

Magnetic dip (inclination)

δ

at a place is the angle that the direction of Earth's total magnetic field

B

makes with the horizontal plane. A dip needle free to rotate in the vertical magnetic meridian settles at this angle.
Magnetic declination

θ

at a place is the angle between the geographic meridian (vertical plane through geographic N-S) and the magnetic meridian (vertical plane through the freely suspended needle).
Together with the horizontal component

B_{H}

, these are the elements that fix Earth's field at a place.

CBSE Class 12 Board · 2005 · Subjective

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