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Electricity and Magnetism - 2 — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSElectricity and Magnetism - 24 Marks
Question
Define the terms magnetic declination and dip with reference to freely suspended magnet.
(a) What do you understand by the terms magnetic meridian and geographic meridian?
(b) At what places on the earth will the angle of dip be (1) maximum and (2) minimum?
✓

Answer

Magnetic declination: The angle through which freely suspended magnetic needle is inclined to the geographic axis is known as magnetic declination.
OR
The angle between the geographic meridian and magnetic meridian it is given place is called declination.
Magnetic dip : The angle between the horizontal axis passing through freely suspended magnet and the direction of earth's magnetic field is called magnetic dip.
(a) Magnetic meridian : The vertical plane containing the magnetic axis of a freely suspended magnet at rest, under the action of magnetic intensity of earth is called magnetic meridian.
Geographic meridian: The vertical plane which contains geographic north and south pole of earth at a given place is called geographic meridian.
(b) The angle of dip is maximum e. $90^{\circ}$ at the magnetic poles. The angle of dip is minimum i.e. $0^{\circ}$ at the magnetic equator.

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