# Earths magnetic field using a tangent galvanometer. (DOC) to study earth's magnetic field using a tangent galvanometer 2022-10-31

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## To study the earth's magnetic field using a tangent galvanometer

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. Here, we shall take a look at who invented the tangent galvanometer. However, all efforts are made to clarify any doubt by the teachers engaging these laboratory classes. Apply linear fit to the graph tanÎ¸ vs. If this is not so, rotate the box without disturbing the position of the coil till at least one of the ends of the pointer stands at the zero mark. You will switch between views using the buttons at the top left edge of the screens. Since electric current is a flow of charge, there is a magnetic field around any current carrying wire.

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## (DOC) to study earth's magnetic field using a tangent galvanometer

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 angle Î¸ can be found by using a compass. Figure 1 shows the vector sum Bnet of the Earth's magnetic field BEarth and the magnetic field due to the current BLoop for the case when the coils of the galvanometer are oriented so that the Earth's magnetic field BEarth is parallel to the plane of the coils. 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. Ã‚Â· The radius of the circular coil is found by measuring the circumference of the coil using a thread around the coil. Commutator: It is a kind of switch employed in electrical circuits, electric motors and electric generators.

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## Tangent Galvanometer: Concept, History, and Uses

The two views are completely independent. It consists of a coil of insulated copper wire wound on a circular non-magnetic frame. Enter your data in Logger Pro and plot both Î¸ vs. In fact, the north magnetic pole is located close to the Earth's South Pole in Antarctica , while the south magnetic pole is located close to the Earth's North Pole in Canada. Now, even very precise measurements of electric current can be carried out with great efficiency. Now reverse the direction of current by using the reserve key.

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## tangent_childhealthpolicy.vumc.org

The magnetic field of the coil is parallel to the coil axis. Value of deflection, Mean Tan Ammeter Reading A For direct currentFor reverse current 1234ObservedCorrected 1. The magnetic field of the earth is â€¦ Magnetic Fields â€” Tangent Galvanometer Introduction and Theory: Just like an electric field exists around electric charges, there is a magnetic field surrounding a permanent magnet and around moving electric charges. Because of the relationship given by equation 4 this equipment is called a tangent galvanometer. Therefore, you should find that the plots of tanÎ¸ vs.

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## Earth's magnetic field by using tangentgalvanometer

The earliest form of the electromagnetic galvanometer was invented by Johann Schweigger in the year 1820. However, under the influence of the two magnetic fields, the compass takes the direction of their resultant field Bnet. This way, when there is an application of current; one can measure the angle the needle turns. In many situations the magnetic field has a value considerably less than one Tesla. Read the both ends of the pointer. Like an electric field, the magnetic field also is a vector quantity and has both a magnitude and a direction. Take some time to become familiar with each view.

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## Magnetic Field for Tangent Galvanometer Calculator

Each of these quadrants equals a quarter of a circle. Drag the end of the vector BEarth to point in the magnetic north direction as shown in Figure 3a. Align again the direction of the vector BEarth with compass needle to. Log in to Virtual Physics Labs using your KET ID and password. The magnetic field can be calculated as follows:1. It is used to reverse the direction of current in the circuit. Using a spirit level, level the base and compass needle in compass box of tangent galvanometer by adjusting the leveling screw.

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## Measuring earth's magnetic field using tangent galvanometer project

Note that this field vector is parallel to the axis of the coil. Procedure: Before starting the experiment please get practice with the virtual equipment! APPARATUS REQUIRED Tangent galvanometer TG , commutator, battery, rheostat, ammeter, key and connecting wires. You can also select the units if any for Input s and the Output as well. If the current is expressed in amperes A , and the radius in meters m , the unit of magnetic field strength is Tesla T. The plane of coil must be set in magnetic meridian. . This led to a massive improvement in the electric current measurement.

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## Horizontal Component of EarthÃ¢â‚¬â„¢s Magnetic Field Using Tangent Galvanometer

But only one of them can match our right hand rule. You will do that as follows. The magnetic needle is then under the action of two mutually perpendicular fields. You also observed that with the current on, the compass always points in the direction of Bnet - about 37Â° north of east. N and tanÎ¸ vs. The coil unit has a compass mounted in the middle. Also, there are four quadrants on a scale on the device.

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In this view the number of loops N is fixed at 4 and the current I is fixed at 3. In other words in these orientations of the loop the magnetic field vectors B Earth and B Loop are parallel or antiparallel see Figure 4a and Figure 4b. The deflection should not be outside the range 30-60. It acts in accordance with the principle of tangent law. Are both graphs linear? In the Overhead view shown in Figure 2a, you see two vector arrows. Bnet BLoop BEarth BEarth BLoop Bnet Figure 4a.

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I both should yield a straight line through the origin equation 4. The entire apparatus can be rotated in the overhead view by dragging the Handle. Remember that the red end of the compass is its north end seeking Earth's North Pole. The field has a shape very similar to the field produced by a bar magnet. This allowed him to prove the validity of an important law by using the tangent bussol. In this view the number of loops N is fixed at 4 and the current I is fixed at 3. 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.

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