The current theory is that a planet will have a strong magnetic field if it has:
A) fast rotation and a solid core.
B) slow rotation and a liquid core.
C) fast rotation and a liquid core.
D) slow rotation and a solid core.

Question

Quizplus · Accepted Answer

A planet is likely to have a strong magnetic field if it has a fast rotation and a liquid core. This combination facilitates the dynamo effect, where the movement of conducting materials (like the liquid iron in Earth's outer core) generates a magnetic field.

The Current Theory Is That a Planet Will Have a Strong