The commutator can reverse the current through the T. It will involve switching the current on and off and rotating the apparatus. This will set the plane of the coil exactly in the magnetic meridian. However, all efforts are made to clarify any doubt by the teachers engaging these laboratory classes. To determine the reduction factor of T.
Â· The connections are made as shown in Figure c. Like an electric field, the magnetic field also is a vector quantity and has both a magnitude and a direction. The direction of a magnetic field at any point in space is the direction indicated by the north pole of a small compass needle placed at that point. You will take compass reading there. Horizontal Component of Earth's Magnetic Field is denoted by B H symbol. Apply linear fit to the graph tanθ vs. The two views are completely independent.
Now, even very precise measurements of electric current can be carried out with great efficiency. Usually, the tangent galvanometers are placed on a flat surface. If the curled fingers of the right hand are pointed in the direction of the current the thumb, placed at the center of the loop, indicates the direction of the magnetic field. E N Figure 3a. What is a Tangent Galvanometer? I and tanθ vs. Nervander had ensured inventive coiling arrangements in his invention.
Â· The radius of the circular coil is found by measuring the circumference of the coil using a thread around the coil. All the readings must be adjusted between 30o and 600. The apparatus is viewed from two perspectives: Overhead Figure 2a , and Oblique Figure 2b. The tangent galvanometer refers to a device that facilitates the measurement of current. At these two orientations of the loop the direction of the total magnetic field Bnet and therefore the direction of the needle is unchanged only the magnitude is changed when the current is turned on and off. According to this law, the deviation angle tangent of the tangent-bussol needle is proportional to the flowing electric current. The advanced forms utilise beams of light for determining the measurements.
Diagram Theory Tangent galvanometer is an early measuring instrument for small electric currents. But only one of them can match our right hand rule. Take some time to become familiar with each view. Here, a magnetic needle is suspended at a point where the crossing of two fields takes place at right angles to each other. Rather these vectors can be rotated as needed by dragging the points of the arrows. You will only work with one view while performing a given part of the lab. Note that this field vector is parallel to the axis of the coil.
How does the magnetic field of a coil depend on the current in the coil? You will switch between views using the buttons at the top left edge of the screens. Â· A suitable current is allowed to pass through the circuit, the deflections Î¸1 and Î¸2 are noted from two ends of the aluminium pointer. Electric Current - Measured in Ampere - Electric Current is the time rate of flow of charge through a cross sectional area. The direction of a magnetic field at any point in space is the direction indicated by the north pole of a small compass needle placed at that point. BEarth supplies the northward component, so BLoop must be to the east as in Figure 3b. If the curled fingers of the right hand are pointed in the direction of the current the thumb, placed at the center of the loop, indicates the direction of the magnetic field. Â· The experiment is repeated for various values of current and the readings are noted and tabulated.
This magnetic field is felt at the surface of the earth too, and it is the very reason why a magnetic compass aligns itself in a particular direction. Because of the relationship given by equation 4 this equipment is called a tangent galvanometer. A frame with a pair of vertical supports provides two nails which hold 1 to 5 circular loops of insulated wire. You will need to experiment a bit. The magnetic field of the coil is parallel to the coil axis. Make the circuit connections in accordance with the circuit diagram. The plane of the coil will not be exactly in the magnetic meridian.
Commutator: It is a kind of switch employed in electrical circuits, electric motors and electric generators. Vector sum of the magnetic fields. The experiments included are meant to offer basic understanding of Physics. Index Introduction Materials Required Principle Diagram Theory Procedure Observations Calculations Result Precautions Sources of error Bobliography Materials Required Tangent galvanometer TG , Rheostat R , Battery E , Ammeter A , Key k Reversing key Connecting wires Metre scale Principle When a bar magnet is suspended in two Magnetic fields B and Bh, it comes to rest making an angle with the direction of Bh. N or tanθ vs. N and tanθ vs. A magnet is characterised by a magnetic dipole moment with magnetic field lines associated with it, known as geomagnetic field.