# Tangent Galvanometer Project

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PROJECT REPORT

Topic:
Earth Magnetic Field Using
Tangent Galvanometer

Submitted By: Ravi Saini Class-12th Roll No.-14
Introduction

Although historically ancient travelers made abundant use of the earth’s magnetic field for the exploration of the earth, they were ignorant of its origin. In many respects the earth’s magnetic field exhibits characteristics similar to those of a bar magnet; nonetheless, the mechanisms responsible for generating each are vastly different. Magnetic field lines appear to originate near the south geographic pole, i.e. magnetic north pole, and terminate near the north geographic pole, i.e. magnetic south pole. It is interesting to note that in the vicinity of Wilmington, North Carolina the magnetic field lines enter the earth at a relatively steep angle. The angle of inclination or dip angle, which is the angle that a compass needle makes with respect to the plane of the horizon, is approximately 60 degree. In this experiment principles of magnetostatics and elementary vector analysis are used to determine the earth’s magnetic field in the vicinity of Wilmington, North Carolina. The primary equipment used in performing the experiment.

Aim

The purpose of this experiment is to measure the horizontal and vertical components of the earth's magnetic field. We will accomplish this by using a tangent galvanometer, an instrument which preceded the modern ammeter. The tangent galvanometer was originally designed to measure an unknown current by comparing the magnetic field produced by that current

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