^Vibration magnetometer A magnet free to vibrate about vertical axis passing through its CM is first kept in a non- magnetic hook along BH. On deflecting it slightly by an amount θ, it experiences a restoring torque due to horizontal component of earth’s field BH τ = M BH sinθ ≈M BH θ [As sinθ […]
^Tangent galvanometer It is an instrument used to detect small currents using tangent law by keeping the magnetic needle at equilibrium under the torques of the Bcoil & BH. The plane of the coil is set parallel to the magnetic meridian such that the magnetic needle points 0– 0 position. Now current to be measured […]
^Neutral points Neutral points are the positions where the magnetic field of a magnet is completely neutralised by the horizontal component of earth’s magnetic field. The position & number of neutral points depends upon the position of magnet. If a magnet is placed vertically as shown then we get only one neutral point situated at […]
^Cause of earth’s magnetism 1. Gilbert suggested that the earth itself behaves like a giant magnet. The earth’s core is known to contain iron. Yet geologists do not regard this as a source of earth’s magnetism. As the molten iron is not ferromagnetic. 2. Due to Ionization of gases of atmosphere layer of charge particles […]
^Evidence earth’s magnetism The following facts provide sufficient evidence in support of the existance of earth’s magnetism. 1. Directive property of magnet. 2. Availability of neutral points. 3. Iron piece burried under earth becomes magnet. 4. Behaviour of magnetic needle is different at different points.
^Aclinic line Lines joining the places of zero dip. At all places on the aclinic line a freely suspended magnet will remain horizontal.
^Agonic line Lines joining the places of zero declination. Along Agonic lines a compass needle will point geographical north. Thus the places east of agonic line will have the west declination as the compass needle point west of north.
^Isodynamic lines Lines joining the places of equal horizontal component of earth’s magnetic field (BH).
^Isoclinic lines Lines joining the places of equal dip (δ).
^Isoclinic lines Lines joining the places of equal dip (δ).
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