Name any one instrument which works on the principle of Tangent law in magnetism.

State Tangent Law in magnetism.

Name of the instrument which measures weight.

Statement 1: Both dc and ac can be measured by a hot wire instrument. Statement 2: the hot wire instrument is based on the principle of magnetic effect of current.

Name the instrument which has the least count 0.1 mm .

Name the instrument which has the least count 0.01 mm.

Name any one element of each group.

Name the principle on which it works.

Name the instrument which has the least count 1 mm .

One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram. Name one instrument which works on the above principle.

Give any one evidence which points towards the existance of the Earth.s magnetic field .