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The fourth exam for the general physics ii course at st. Vincent college. The exam consists of four problems related to electric and magnetic fields, current density, and the behavior of charged particles. Students are required to determine velocities, masses, radii of curvature, current densities, magnetic fields, and forces acting on charges.
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St. Vincent College PH 112: General Physics II
The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages.
Problem 1 25
Problem 2 25 Problem 3 25
Problem 4 25
Total 100
a) (5 pts) In what direction, relative to the direction of a uniform magnetic field, must a charged particle be traveling in order to experience the largest possible magnetic force?
b) (5 pts) A uniform magnetic field points out the page. When observed from this point of view, a charged particle undergoes clock-wise circular motion while in this field. What is the sign of the charge on the particle?
c) (5 pts) In the Biot-Savart Law,
what is the direction of the unit vector
d) (5 pts) A single wire carrying current passes through a region of space. The integral portion of
is computed around a closed path that does not encircle the wire. The result of the integral is thus zero. Does this necessitate that the magnetic field is therefore zero?
e) (5 pts) Electric fields begin at negative charges and end at positive charges. Discuss the “beginning” and “ending” of magnetic field lines, including in which direction the magnetic field points.
a) (5 pts) Determine the current density in the cable.
b) (10 pts) Determine the magnetic field at a distance of 10 cm from the center of the wire.
c) (10 pts) Determine the magnetic field at a distance of 3 cm from the center of the wire.
m/s through a region in which both a uniform magnetic field and a uniform electric field exist. What is the total force (vector)
V/m?
b) (10 pts) Two long parallel wires are separated by a distance of 0.1 m. The force per unit length that
to the right, what is the current (and direction) in the other wire?
