Physics 100B - General Physics II » Spring 2022 » Pre-Class 9

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Question #1
A charged particle enters into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic fieldvector. Ignoring the particle's weight, what type of path will the particle follow?
A.   The charged particle will follow a parabolic path.
B.   The charged particle will follow a spiral path.
C.   The charged particle will follow a circular path.
D.   The charged particle will follow a straight-line path.
Question #2
Which of the following statements are true for magnetic force acting on a current-carrying wire in a uniform magnetic field?
A.   The magnetic force on the current-carrying wire is strongest when the current is parallel to the magnetic field lines.
B.   The magnetic force on the current-carrying wire is strongest when the current is parallel to the magnetic field lines. The direction of the magnetic force acting on a current-carrying wire in a uniform magnetic field is perpendicular to the direction of the field.
C.   The direction of the magnetic force acting on a current-carrying wire in a uniform magnetic field is perpendicular to the direction of the current. The magnetic force on the current-carrying wire is strongest when the current is perpendicular to the magnetic field lines. The direction of the magnetic force acting on a current-carrying wire in a uniform magnetic field is perpendicular. to the direction of the field.
D.   The direction of the magnetic force acting on a current-carrying wire in a uniform magnetic field is perpendicular to the direction of the current. The magnetic force on the current-carrying wire is strongest when the current is parallel to the magnetic field lines.
Question #3
The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by B. What is themagnitude of the magnetic field at twice the distance from the conductor?
A.   At twice the distance, the magnitude of the field is 4B.
B.   At twice the distance, the magnitude of the field is 2B.
C.   At twice the distance, the magnitude of the field is B/2.
D.   At twice the distance, the magnitude of the field remains equal to B.
E.   At twice the distance, the magnitude of the field is B/4.

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