Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C
b. 4.1 N/C
c. 3.5 N/C
d. 3.2 N/C
e. 0.28 N/C
b
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An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U
A) K increases and U decreases. B) K decreases and U decreases. C) K increases and U increases. D) K decreases and U increases. E) Cannot be determined without knowing the initial height of the acorn.
A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image
Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture? A) 1.6 mrad B) 2.2 mrad C) 3.2 mrad D) 4.5 mrad E) 6.3 mrad
Current: How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?
A. 20 C B. 2.0 C C. 5.0 C D. 0.050 C
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) 170 J/m3 C) 84 J/m3 D) 250 J/m3 E) 210 J/m3