Each plate of an air-filled parallel-plate air capacitor has an area of 0.0040 m2, and the separation of the plates is 0.080 mm
An electric field of 5.3 × 106 V/m is present between the plates. What is the energy density between the plates? (?0 = 8.85 × 10-12 C2/N • m2)
A) 124 J/m3
B) 84 J/m3
C) 170 J/m3
D) 210 J/m3
E) 250 J/m3
A
You might also like to view...
The first-quarter Moon rises
a. at about noon. b. at sunset. c. at sunrise. d. at about midnight. e. during the second week of each calendar month.
An aniline-alcohol solution is flowing at a velocity of 3 m/s through a long, 2.5 cm-ID thin-wall tube. Steam is condensing at atmospheric pressure, on the outer surface of the tube, and the tube-wall temperature is 100°C. The tube is clean, and there is no thermal resistance due to a scale deposit on the inner surface. Using the physical properties tabulated below, estimate the heat transfer coefficient between the fluid and the pipe using and compare the results. Assume that the bulk temperature of the aniline solution is 20°C and neglect entrance effects.
GIVEN
• An aniline-alcohol solution flowing through a thin-walled tube
• Tube is clean with no scaling on inner surface
• Velocity (V) =3 m/s
• Inside diameter of tube (D) = 2.5 cm = 0.025 m
• Tube wall surface temperature (Ts) = 100°C
• Solution has the properties listed above
• Solution bulk temperature (Tb)= 20°C FIND
• The heat transfer coefficient ( ch ) using: (a) Equation (7.61) (b) Equation (7.66)
ASSUMPTIONS
• Steady state
• Entrance effects are negligible
• Thermal resistance of the tube is negligible
• Tube wall temperature is constant and uniform
• Fully developed flow
SKETCH
PROPERTIES AND CONSTANTS
The density of water ? 1000 kg/m3
While the mantles of Jupiter and Saturn are made of liquid metallic hydrogen, the mantles of Uranus and Neptune are chiefly
A) water. B) rock. C) helium. D) methane. E) ammonia.
About how old is Earth?
a. 6000 years b. 1 million years c. 1 billion years d. 5 billion years e. 14 billion years