## PHYS208 Fundamentals of Physics II

### Hint for Ch. 28, 43P

Refer to the LearningWare module on CD-Physics 2.0 for a systematic treatment of
this circuit. *Beware of the error in its second application of the loop rule!*
An alternative to a fully general solution in terms of three currents i_{1},
i_{2}, and i_{3} relies on an underlying symmetry of the circuit.
Note that the equivalent resistance of all three branches is 2.0 ohm.
Thus since the emf in the center and right branch is identical, the same current must flow
in each; by application of the junction rule, twice that current must flow in the left branch.
An application of the loop rule to the left inner loop quickly yields the desired answers.

"http://www.physics.udel.edu/~watson/phys208/exercises/hints/28-43P.html"

Last updated Feb. 21, 1998.

Copyright George Watson, Univ. of Delaware, 1997.