Vector sum of the magnetic fields. The instrument used in this experiment is a tangent galvanometer that consists of 1-5 turns of wire oriented in a vertical plane that produce a horizontal magnetic field. The magnetic field of the earth is thought to be caused by convection currents in the outer core of the earth working in concert with the rotation of the earth. According to this law, the deviation angle tangent of the tangent-bussol needle is proportional to the flowing electric current. You will need to experiment a bit. I both should yield a straight line through the origin equation 4. You will take compass reading there.
Are both graphs linear? You will switch between views using the buttons at the top left edge of the screens. In this setting, the ends of aluminum pointer should reads zero-zero. The direction of the magnetic field at the center of the wire loop can be determined with the help of the right-hand-rule. Like an electric field, the magnetic field also is a vector quantity and has both a magnitude and a direction. Nervander designed this instrument. In your lab report show the vector addition of B Earth with each of the two possible B Loop.
Begin with the power turned off. Inner diameter d1Outer diameterd2Mean Diameter d Mean Radius 1. The angle θ can be found by using a compass. In the year 1834, J. These instruments have the following main parts- a vertical copper wire, a circular frame, and a compass needle in the middle.
What is a Tangent Galvanometer? Final conclusion: Do your experimental findings support equation 1? The commutator can reverse the current through the T. When the power is on and current flows through the loop, a magnetic field due to the current is produced inside the loop. View 1: Overhead Figure 2b. Log in to Virtual Physics Labs using your KET ID and password. However, under the influence of the two magnetic fields, the compass takes the direction of their resultant field Bnet. If the current is expressed in amperes A , and the radius in meters m , the unit of magnetic field strength is Tesla T.
The earliest form of the electromagnetic galvanometer was invented by Johann Schweigger in the year 1820. The necessary theory for this type of experiments is described in the manual in self-explanatory manner. Â· The reduction factor k is calculated for each case and it is found that k is a constant. A frame with a pair of vertical supports provides two nails which hold 1 to 5 circular loops of insulated wire. The horizontal component of the earth's field can now be found by measuring the field due to the coils and the direction of the net magnetic field relative to the direction of the earth's field. You can also select the units if any for Input s and the Output as well.
Now rotate the coil of the galvanometer about its vertical axis, till the magnetic needle, its image in the plane of the mirror fixed at the base of the compass box and the coil ie all these three lie in the same vertical plane. The direction of the magnetic field at the center of the wire loop can be determined with the help of the right-hand-rule. Also, there are four quadrants on a scale on the device. The advanced forms utilise beams of light for determining the measurements. Taking the average of the resulting two readings for deflection averages out, any small error in positioning the TG coil relative to the earths magnetic field Bh.
This allowed him to prove the validity of an important law by using the tangent bussol. Over the years, the Tangent galvanometers have been designed in various forms. THEORY Introduction Earth is a magnet, just like any other magnet one might have seen. This made possible the utilisation of a long magnetic needle. You will only work with one view while performing a given part of the lab.
· It helps in the determination of the accurate strength of the magnetic field of the Earth. Therefore, you should find that the plots of tanθ vs. In this view the number of loops N is fixed at 4 and the current I is fixed at 3. The other represents the magnetic field produced by the current-carrying wire loops. This manual gives necessary details to perform the experiments. 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. How to calculate Magnetic Field for Tangent Galvanometer using this online calculator? 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.
The magnetic field of the coil is parallel to the coil axis. 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. The entire apparatus can be rotated in the overhead view by dragging the Handle. The principle can be used to compare the galvanometer constants. 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. Whenever an electrical current takes place, the compass needle will respond to the magnetic field. You will switch between views using the buttons at the top left edge of the screens.
It is used to reverse the direction of current in the circuit. To determine the reduction factor of T. Read the both ends of the pointer. View 1: Overhead Figure 2b. It is the value indicated on a scale by a pointer that is connected to the suspension wire.