A short bar magnet is placed in the magnetic meridian of the earth with North Pole pointing north. Neutral points are found at a distance of 30 cm from the magnet on the East-West line, drawn through the middle point of the magnet. The magnetic moment of the magnet in \[A{{m}^{2}}\] is close to: (Given \[\frac{{{\mu }_{0}}}{4\pi }={{10}^{-7}}\] in SI units and \[{{B}_{H}}\]=Horizontal component of earth's magnetic field \[=3.6\times {{10}^{-5}}\,tesla\])

A short bar magnet is placed in the magnetic meridian of the earth wit

1.	A short bar magnet is placed in the magnetic meridian of the earth with North Pole pointing north. Neutral points are found at a distance of 30 cm from the magnet on the East-West line, drawn through the middle point of the magnet. The magnetic moment of the magnet in \[A{{m}^{2}}\] is close to: (Given \[\frac{{{\mu }_{0}}}{4\pi }={{10}^{-7}}\] in SI units and \[{{B}_{H}}\]=Horizontal component of earth's magnetic field \[=3.6\times {{10}^{-5}}\,tesla\])
A.	14.6
B.	19.4
C.	9.7
D.	4.9
Answer» D. 4.9