Question

Earth's magnetic field is generated due to _________.
1. Rotational motion of earth
2. Heavy size of the earth
3. Convection current in the core
4. None of the above

Answer 1

Correct Answer - Option 3 : Convection current in the core

CONCEPT:

• The earth’s magnetism is caused due to dynamo effect.
• The outer core consists of molten iron, while the inner core has the solidified elements.
• The earth gets its own magnetic field lines because of the presence of metallic fluids in the core.
• The convection currents of molten iron and nickel in the earth’s core are responsible for the earth's magnetic field.
• These currents carry streams of charged particles and generate magnetic fields.

EXPLANATION:

• The earth's magnetic field is generated due to the convection current in the core.
• These core have metallic fluids in which convection current flows.
• So the correct answer is option 3.