Overview

This experiment uses a tangent galvanometer to measure the magnetic field produced by a current in a coil (B_c).

When the coil’s field is perpendicular to the Earth’s horizontal magnetic field (B_e), the net magnetic field is the vector sum of both fields. The horizontal component of the Earth’s magnetic field is related to the coil’s field by:

Significance of the Experiment
This experiment is fundamental for understanding magnetic fields, electromagnetism, and calibration of galvanometers.