It would be possible to make a compass needle out of aluminum if
A) It were suspended and not pivoted on bearings.
B) The earth's magnetic field were rapidly changing with time
C) The earth's magnetic field were stronger
D) the needle were made to be very large.

Question

Quizplus · Accepted Answer

Aluminum is not ferromagnetic, but it is paramagnetic, meaning it weakly interacts with magnetic fields. If the Earth's magnetic field were rapidly changing with time, it could induce a current in the aluminum (due to electromagnetic induction), which in turn could create a magnetic field in the aluminum, allowing it to act as a compass needle. The other options do not fundamentally change aluminum's ability to interact with the Earth's magnetic field in a way that would allow it to function as a traditional compass needle.

It Would Be Possible to Make a Compass Needle Out