State what a gravitational field line represents.
The Earth can be treated as a uniform sphere, as shown in Fig. 2.1. On Fig. 2.1, draw field lines to show the Earth’s gravitational field outside the Earth.
The Earth’s magnetic field may be thought of as arising from the Earth behaving like a long solenoid, as shown in Fig. 2.2.
On Fig. 2.3, write the letters N and S on the magnetic poles to show which is the magnetic N pole and which is the magnetic S pole.
On Fig. 2.3, draw field lines to show the Earth’s magnetic field outside the Earth.
An observer travels around the Earth’s surface. Use your answer in (a)(ii) to explain why the Earth’s gravitational field observed does not vary around the surface.
With reference to your answer in (b)(ii), describe how the Earth’s observed magnetic field changes around the surface.
An observer travels over the Earth’s surface.