Question

It is a common notion that the earth's magnetism is due to the

• A. presence of a huge permanent magnet in the interior of earth
• B. presence of electric currents circulating in the interior of the earth.
• C. presence of ions in the atmosphere due to which currents are caused as the earth rotates
• D. influence of a nuclear explosion.

Answer 1

The correct option is C

presence of ions in the atmosphere due to which currents are caused as the earth rotates

1. Earth's magnetism is generally due to the convection currents which carry streams of charged particles called ions.
2. This convection current generates magnetic fields which deflect ionizing charged particles from the sun.
3. It is a common notion that the earth's magnetism is due to the presence of ions in the atmosphere due to which currents are caused as the earth rotates.

Hence, option (C) is the correct answer.