Pick up the correct statement from the following :
1.in the earth's magnetic field, a magnetic needle rests in magnetic meridian
2.the angle between the true meridian and the magnetic meridian is called magnetic variation
3.one end of the magnetic needle supported at its centre of gravity tends to dip down towards the. nearer magnetic pole of the earth
4.all the above.
Posted Date:-2021-03-26 00:56:27