Two infinite parallel surfaces carry uniform charge densities of 0.20 nC/m2 and ?0.60 nC/m2 . What is the magnitude of the electric field at a point between the two surfaces?
a. 34 N/C
b. 23 N/C
c. 45 N/C
d. 17 N/C
e. 90 N/C
c
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A) -2.2 × 104 J B) -4.4 × 104 J C) -4.8 × 105 J D) -9.7 × 105 J
A 15-?F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted? What will be an ideal response?
Solar power is about
A. 1 watt per square meter B. 1 kW per square meter C. 1 megawatt per square km D. 1 gigawatt per square km
In optical fibers of uniform density, light actually
A) curves in a direction parallel to the central axis of the fiber. B) travels in straight-line segments. C) travels along the outer surface of the fiber. D) none of the above