Measuring earth’s magnetic field from the detection of a compass needle - PhysLab

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Measuring earth's magnetic field from the detection of a compass needle

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Student Manual

This experiment aims to find the horizontal component of the earth's magnetic field using a simple experiment. The experiment involves the investigation of the combined effect of the magnetic fields produced by the earth and a current carrying multi-turn coil. With the help of graphs, students are expected to study the relation of current through the coil and the magnetic field that it generates. Furthermore, magnetic fields measured at different distances will provide insight into the distance dependence of the magnetic field.

Sample Results Finding the magnetic field of earth
Magnetic field vs current
Current vs angle of deflection (at 4 cm)
Current vs angle of deflection
Current vs angle of deflection (at 25 cm)
Hardware Manual Hall-effect sensor specifications
Experiment Code 1.23
Version March 25, 2019 Version 2019-4

Further Readings and References

  • Magnetic fields due to currents
    Fundamentals of Physics, Halliday, Resnick and Walker, 9th Edition, Section 29-6, .
  • Earth’s magnetic field
    Conceptual Physics, Paul G Hewitt, 10th Edition, 469-470, .

Pictorial Procedure

1. Photograph of the overall apparatus
2. The power supply controls the current through the coil.
3. The compass needle deflects and the angle is measured.
4. Setup for measuring the magnetic field strength using a Hall sensor

5. The Hall voltage offset is set using a screw driver
6. The Hall voltage is amplified using an amplification module to measure the magnetic field strength at the compass locations

Lab 1 | Tags: electricity and magnetism, electromagnetism, magnetism
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  • Home
  • About Us
    • Overview
    • Centre for Experimental Physics Education (CEPE)
    • Physlab Team
    • Physlab Guidebook
    • Alumni
    • Open Positions
    • Muhammad Sabieh Anwar (Personal)
  • Academics
    • Lab Courses
    • Lab-I (ENGG-100/PHY-100/200)
    • Lab-II (PHY 300/500)
    • AstroLAB
    • Ibn Sahl Corner for Optics
    • Fast Optics
    • Smart Physics
    • Single Photon Quantum Mechanics Lab
    • Chasing Cosmic Ray Muons at Physlab
    • Stories
    • Physics Studio
    • Research Stories
    • Class Activities
    • Courses Taught
    • Class Demonstrations
    • PhysDiary
    • Health and Safety
    • Lab Safety
    • Workplace Organization
  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • Media
      • Lectures, Podcasts and Interviews
      • Videobytes
      • YouTube Channel
      • Visitors
      • Testimonials
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open house
      • 2009-2015
      • Open house 2023
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
    • Forms
    • Equipment Howto’s
  • PhysGPT
  • Contact Us