An experiment consists of a tube standing perfectly perpendicular to the surface

Question

An experiment consists of a tube standing perfectly perpendicular to the surface of the earth. A perfectly uniform magnetic field points from the top of the tube to the surface of the earth. The magnetic field is much stronger than that of the earth. A small loop of wire is dropped into the top of the apparatus and it falls under gravity, starting off perfectly parallel to the earth's surface. Under what circumstance is an emf induced in the small loop of wire?

Answer

Under all circumstances since the loop is accelerating under gravity

The loop rotates about an axis as it falls, so it does not stay perfectly parallel to earth's surface

Under no circumstances since electric current is not at all related to magnetic field

Under no circumstances, since the magnetic field in the apparatus is perfectly uniform

Provided that the loop stays perfectly parallel to the earth's surface as it falls

Under all circumstances since the loop is accelerating under gravity

The loop rotates about an axis as it falls, so it does not stay perfectly parallel to earth's surface

Under no circumstances since electric current is not at all related to magnetic field

Under no circumstances, since the magnetic field in the apparatus is perfectly uniform

Provided that the loop stays perfectly parallel to the earth's surface as it falls

Explanation / Answer

Provided that the loop stays perfectly parallel to the earth's surface as it falls

Provided that the loop stays perfectly parallel to the earth's surface as it falls

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