The lamp most similar to the common fluorescent lamp is the
A) LED.
B) CFL.
C) incandescent lamp.
D) none of the above
Answer: B
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A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) The induced current flows counterclockwise. B) The induced current flows clockwise. C) There is no induced current in this coil. D) The current flows clockwise initially, and then it flows counterclockwise before stopping. E) The current flows counterclockwise initially, and then it flows clockwise before stopping.
On a scale in which the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is
A) small enough to fit within your hand. B) about 1 meter. C) about 5 meters. D) about 30 meters.
As a pressurized aircraft gains altitude, the force acting on the boarding door due to the difference between the outside air pressure and the pressure inside the aircraft _____________ with height
Fill in the blank(s) with correct word
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?