SND Bharat Brass and Bakelite Tangent Galvanometer for Scientific Labs DI-137

SND Bharat Brass and Bakelite Tangent Galvanometer for Scientific Labs DI-137 is a device used in laboratories to measure the strength and direction of electric currents. It consists of a circular coil of wire, usually wound on a non-magnetic frame, with a magnetic needle placed at the center of the coil. The coil is connected in series with a battery and a variable resistor, allowing the current passing through the coil to be adjusted.

To use a tangent galvanometer, first, the coil needs to be properly set up. This involves ensuring that the coil is wound tightly and evenly, and that the magnetic needle is aligned with the zero mark on the scale. The galvanometer should also be placed in a location where there are no magnetic disturbances, such as near other magnets or electrical equipment.

Once the setup is complete, the galvanometer can be used to measure the current. The variable resistor is adjusted to allow a small current to pass through the coil. As the current flows, it creates a magnetic field around the coil, which interacts with the magnetic needle. The needle will align itself with the magnetic field lines, indicating the direction of the current.

To measure the strength of the current, the tangent law is used. The tangent of the angle of deflection of the needle is directly proportional to the strength of the current passing through the coil. By measuring the angle of deflection using the scale on the galvanometer, the current can be calculated using the tangent law.

It is important to note that the tangent galvanometer is only suitable for measuring small currents. If the current is too large, it can cause the needle to become permanently magnetized or even damage the coil. Therefore, it is necessary to use a current-limiting resistor in series with the galvanometer to prevent excessive current flow.

In conclusion, a tangent galvanometer is a useful tool in laboratories for measuring the strength and direction of electric currents. By properly setting up the coil and using the tangent law, accurate measurements can be obtained. However, it is important to use caution and limit the current to prevent damage to the galvanometer.

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