The earth’s magnetic field on its surface is characterised by three quantities: (a) declination (b)inclination of dip and (c) the horizontal component of earth’s magnetic field. These are known as elements of earth’s magnetic field. At a place the angle between the geographic meridian and the magnetic meridian is called the declination, whereas the angle between the earth’s magnetic field with the horizontal in magnetic meridian is known as magnetic dip.
(i) In a certain place the horizontal component of magnetic field is √3 times the vertical component. The angle of dip at this place is
(a) zero
(b) π/3
(c) \(\frac{\pi}{2}\)
(d) \(\frac{\pi}{6}\)
(ii) The angle between the true geographic north and the earth shown by a compass needle is called as
(a) Inclination
(b ) Magnetic declination
(c) Dip
(d) None of these
(iii) The angle of dip at the poles and the equator respectively are
(a) 30° , 60°
(b) 0° ,90°
(c) 45° ,90°
(d) 90° ,0°
(iv) A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
(a) will become rigid showing no movement.
(b) will stay in any position.
(c) will stay in north-south direction only.
(d) will stay in east-west direction only.
