The plane of a flat, circular loop of wire is horizontal. an external magnetic field is directed perpendicular to the plane of the loop. the magnitude of the external magnetic field is increasing with time. because of this increasing magnetic field, an induced current is flowing clockwise in the loop, as viewed from above. what is the direction of the external magnetic field? justify your conclusion.

the answer is a. at the equator

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.