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The questions and solutions for exam iv of the general physics ii course at st. Vincent college. The exam covers topics on magnetic fields, currents, and related concepts such as ampere's law and torque. Students are expected to understand the behavior of charged particles in magnetic fields, the production of magnetic fields by currents, and the application of ampere's law to calculate magnetic fields.
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St. Vincent College PH 112: General Physics II
The exam consists of 4 questions. 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 20 Problem 2 25 Problem 3 35
Problem 4 20
Total 100
a) (5 pts) Is it possible for the force exerted on a charged particle by a magnetic field to change the speed of the particle? Why or why not?
b) (5 pts) In a lightening stroke, negative charge moves rapidly from the cloud to the ground (assume a generally vertical path). In what direction is the lightening stroke deflected by the magnetic field of the earth?
c) (5 pts) The earth acts like a giant magnet. Which magnetic pole is located under Antarctica?
d) (5 pts) Ampere’s Law may only be _useful_ in certain, symmetric situations. However, can you think of any situations where Ampere’s Law is actually not valid? Explain.
a) (5 pts) How many turns of wire are in the coil?
b) (10 pts) What is the torque on the coil due to gravity if it is hung along one horizontal side at an angle θ measured with respect to vertical? (Your answer will not be a number. Also, you may assume that since the wire is uniform, the center of gravity is at the center of the coil.)
c) (10 pts) What is the torque on the coil due to a vertical magnetic field of 0.01 T when there is 3.4 A of current flowing through it while it is hanging at angle θ? (Again, you answer will not be simply a number.)
d) (10 pts) Finally, determine the equilibrium angle at which the loop hangs under the conditions specified above.
Recall that a proton has a mass of 1. 672 × 10 −^27 kg and that 1 eV is the energy of an electron, mass
