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Unformatted text preview: zzMcLean, James G Physics 125, Analytical Physics II Section 99 Date Sat, Apr 12, 2008 at 11:00 Final Exam New Material 1. [4pt] A conducting loop of wire is placed in a magnetic field that is normal to the plane of the loop, as shown. A B Note that the magnetic field is not uniform. For each of the fol- lowing actions, which way does the induced current flow? Write A for Clockwise, B for Counterclockwise, and N for No current. If the second is Clockwise, the third is Counterclockwise, and the rest have No current, write NABNNNN). A) Steadily decrease the strength of the magnetic field. B) Move a bar magnet in from the right, with the magnet in the plane of the paper, S end pointing towards the loop. C) Steadily increase the radius of the loop. D) Move the loop to the right at a constant velocity. E) Rotate the loop counterclockwise about an axis perpen- dicular to the paper and passing through the loop’s center. F) Rotate the loop about the dashed line so that the right half comes towards you. G) Move the loop towards the bottom of the page. 2. [4pt] Consider two imaginary spherical surfaces of different radii, both centered on a point sound source emitting spherical waves. The power transmitted out of the larger sphere is the power transmitted out of the smaller, and the intensity at a point on the larger sphere is the intensity at a point on the smaller. (Choose one.) A) greater than, the same as B) the same as, the same as C) less than, the same as D) greater than, less than E) the same as, less than F) the same as, greater than G) less than, greater than H) greater than, greater than 3. [3pt] In order for two sound waves to produce audible beats, it is essential that the two waves.. . (Choose one.) A) . . . be traveling in opposite directions. B) . . .have equal frequencies. C) . . . have the same number of harmonics. D) . . . have slightly different amplitudes. E) . . . have slightly different frequencies. 4. [5pt] For each statement, write in T for True, F for False. If the first is for True and the rest for False, enter TFFFFF. A) Sound waves in air are transverse waves. B) Other things being equal, a more dense medium leads to faster waves. C) In a non-dispersive medium, the speed of a wave is the same for all wave frequencies. D) In the expression A sin(4 x- 3 t + 0 . 1), 0.1 is the phase. E) Sound generally travels faster through solids than through air....
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- Spring '08
- Physics, Magnetic Field, James G