PHYS208 Fundamentals of Physics II
November 16, 1992 Midterm Exam 2
to check your work...
- The emf induced in a circuit is proportional to the rate of change of
magnetic flux through the circuit.
- Lenz's law states that the direction of an induced emf is always opposite to the
change in magnetic field that induced it.
- The magnitude of a magnetic field varies inversely
with the square of the distance from the current element that creates the field.
(Note: I now use the term "current infinitesimal" instead of "current element";
the magnetic field created here is an infinitesimal contribution.
2. Evaluate the inductance per meter length of RG58/U cable?
3. Evaluate the force per meter length if the separation d is 1.0 mm
and both currents are 10 A.
4. What should R be for the lamp to flash every 1.5 sec?
Last updated Nov. 12, 1997.
Copyright George Watson, Univ. of Delaware, 1997.