A long wire along the x axis is carrying a current increasing at a constant rate in the +x direction. A rectangular coil lies in the x-y plane in the 4th quadrant. In which direction is the induced magnetic field at the center of the rectangular coil?
a. in the –z direction
b. There is no direction; the induced current in the coil is zero since the x axis and the coil are in the same plane.
c. in the +z direction
d. No direction can be found since the orientation of the rectangular coil is not given.
C
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Consider two future observatories in space. Observatory X consists of a single 50-meter telescope. Observatory Y is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across
Which observatory can detect dimmer stars, and which one can see more detail in its images? (Assume all else is equal, such as quality of optics, types of instruments, and so on.) A) Observatory X can detect dimmer stars and Observatory Y reveals more detail in images. B) Observatory Y can detect dimmer stars and Observatory X reveals more detail in images. C) Observatory X both detects dimmer stars and reveals more detail in images. D) Observatory Y both detects dimmer stars and reveals more detail in images.
How would you include contact resistance between the two materials Derive the appropriate difference equations.
GIVEN
Interface between two materials with different thermal conductivities and contact resistance at the
interface
FIND
(a) The appropriate difference equations
SKETCH
A 10.0-? resistor, 10.0-mH inductor, and 10.0-?F capacitor are connected in series with a 10.0-kHz voltage source. The rms current through the circuit is 0.200 A. Find the rms voltage drop across each of the 3 elements.
What will be an ideal response?
The uncompressed density of a planet in our solar system
a. is greatest for the Jovian planets. b. is greatest for the planets closest to the Sun. c. is greatest for the planets furthest from the Sun. d. is greatest for the planets with the largest mass. e. is greatest of the planet with the largest radius.