Physics for IGCSE & O level - Magnets And Currents (Section 10 - No. 20)
What is the Earth's magnetic field?
A weak field around the Earth that doesn't affect anything.
A field generated by the sun that surrounds the Earth.
A field that protects the Earth from cosmic radiation.
A magnetic field that acts as if there is a large bar magnet inside the Earth.
Vysvětlení
The Earth's magnetic field acts as if there is a large bar magnet inside the Earth.