An experiment consists of a tube standing perfectly perpendicular to the surface
ID: 2254614 • Letter: A
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?
Under no circumstances since electric current is not at all related to magnetic field
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 the magnetic field in the apparatus is perfectly uniform
Provided that the loop stays perfectly parallel to the earth's surface as it falls
A massive charged particle moves in a helical path in a uniform magnetic field. Which of the following statements is true?
The speed of the particle changes
The particle has zero component of velocity perpendicular to the magnetic field
The particle has a non-zero component of velocity parallel to the magnetic field
The kinetic energy of the particle changes since it is exhibiting helical motion
The particle has zero acceleration
A.Under no circumstances since electric current is not at all related to magnetic field
B.Under all circumstances since the loop is accelerating under gravity
C.The loop rotates about an axis as it falls, so it does not stay perfectly parallel to earth's surface
D.Under no circumstances, since the magnetic field in the apparatus is perfectly uniform
E.Provided that the loop stays perfectly parallel to the earth's surface as it falls
A massive charged particle moves in a helical path in a uniform magnetic field. Which of the following statements is true?
A.The speed of the particle changes
B.The particle has zero component of velocity perpendicular to the magnetic field
C.The particle has a non-zero component of velocity parallel to the magnetic field
D.The kinetic energy of the particle changes since it is exhibiting helical motion
E.The particle has zero acceleration
Explanation / Answer
1)
C.
The loop rotates about an axis as it falls, so it does not stay perfectly parallel to earth's surface
2)
C.
The particle has a non-zero component of velocity parallel to the magnetic field
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