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A rectangular coil of 10 turns, each of area 0.05 m 2, is suspended freely in a radial magnetic field of 0.01 T. If the torsional constant of the suspension fibre is 5 × 10 −9 N·m per degree, find the angle through which the coil rotates when a current of 30 μA is passed through it.
The basic principle of a moving coil galvanometer is that when a current carrying coil is placed in a magnetic field, it experiences a torque. When a current I is passed through the coil, the torque experienced is given by τ =N I ABsinθ.
The simple view of the construction of the moving coil instrument is shown in the figure. It consists of a powerful permanent shoe magnet. A light rectangular coil of many turns of fine wire is wound on a light aluminum former. An iron core is inserted inside the coil to reduce reluctance for the magnetic lines of force.
(a) Draw a labelled diagram of a moving coil galvanometer. Describe briefly its principle and working. (b) Answer the following : (i) Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer. (ii) Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity.
Moving Coil Galvanometer Construction and Diagram. The moving coil galvanometer is made up of a rectangular coil that has many turns, and it is usually made of thinly insulated or fine copper wire that is wounded on a metallic frame. The coil is free to rotate about a fixed axis.
Draw a labelled diagram of a moving coil galvanometer. State the principle on which it works. Deduce an expression for the torque acting on a rectangular cur...
This series of articles reviews the fundamental electrical consider-ations in the design of inductors and describes some of the most common coils in use. Basic design considerations. The inductor is similar to a transformer primary, and the workpiece is equiva-lent to the transformer secondary (Fig. 1).
