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Q31 (NDA-II/2012) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

The Earth’s magnetic field is approximately

Result
Your answer: —  ·  Correct: D
Explanation

The Earth's magnetic field, or geomagnetic field, is a weak magnetic field that extends from the planet's interior into space. Its magnitude at the Earth's surface is approximately 0.25 to 0.65 Gauss. In the International System of Units (SI), the strength is measured in Teslas, where 1 Tesla equals 10,000 (10^4) Gauss [1]. Specifically, the field intensity varies from about 25,000 to 65,000 nanoteslas (nT), which corresponds to roughly 0.00005 Tesla or 0.5 Gauss [2]. Among the provided options, 1 Gauss is the closest order of magnitude to the actual surface intensity, as 1 Tesla and 10^4 Tesla represent significantly stronger fields typical of laboratory magnets or astrophysical objects [1]. Therefore, the Earth's magnetic field is approximately 1 Gauss in scale.

Sources

  1. [1] https://www.energy.gov/articles/teslas-lab-los-alamos-powerful-magnets-come-full-circle
  2. [2] https://geomag.bgs.ac.uk/education/earthmag.html
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