Question

Tangent galvanometer is used to measure:
A) Steady currents
B) Current impulses
C) Magnetic moments of bar magnets
D) Earth's magnetic field

Answer 1

A tangent galvanometer is an initial measuring device used to measure electric current. It works by using a compass needle to compare the magnetic field generated by an unknown current to the Earth's magnetic field.Tangent galvanometer is used to measure steady currents.

Complete solution:
Tangent galvanometer is utilized to gauge consistent flows ,Tangent galvanometer is a gadget utilized for estimating current. It chips away at the standard of Tangent law. An attractive needle suspended at a point where there are two crossed fields at right points to one another will stop toward the resultant of the two fields.
The instrument needle begins moving right off the bat affected by Earth's attractive field.
Development proceeds until the attractive field of earth is corresponding with the plane of loop.
At that point, on use of an unknown current, a second attractive field on the pivot of the loop which is opposite to the Earth's attractive field is made.
Consequently the compass needle reacts to the vector entirety of the two fields.
This diversion point is equivalent to the Tangent of the proportion of those two field
At the point when the plane of the loop is set corresponding to the flat segment of Earth's attractive acceptance ($B_H$) and a current is gone through the curl, there will be two attractive fields acting opposite to one another :
(1) the attractive acceptance (B) because of the current in the curl acting ordinary to the plane of the loop and
(2) the level part of Earth's attractive enlistment ($B_H$)

Additional Information:
The working of Tangent galvanometer depends on the rule of Tangent law of attraction.
It comprises a curl of protected copper wire twisted on a round non-attractive edge.
It is most important that the curl wound is done in a helical plan in any case, the field because of the wire will influence the compass needle, subsequently inciting a mistake in the perusing.
This casing is mounted vertically on an even base for help.
The curl of protected copper wire is generally turned on a vertical pivot going through its middle.
A little measured attractive compass with an incredible attractive needle is made to pivot at the focal point of this curl, to such an extent that it is allowed to turn in a level plane.
The round scale is utilized to peruse the development of this attractive needle which is partitioned into four quadrants, each going from 0° to 90°.
A pointer is connected to this needle at right points, typically composed of flimsy aluminum as aluminum is lighter in mass.
The standard method of disposing of prospects of parallax is likewise utilized i.e setting of a plane mirror beneath the compass needle

Note: The tangent law of attraction expresses that the Tangent of the point of a compass needle which is because of the development affected by an attractive field is straightforwardly relative to the proportion of qualities of two opposite attractive fields.
In less complex words, the tangent of the point made by the moving needle under the attractive field legitimately demonstrates the quality of the opposite attractive fields.