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a) Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
b) A parallel plate capacitor with air among the plates has a capacitance of 8 pF. What will be the capacitance if the distance among the plates he reduced by half and the space among them is filled with a substance of dielectric constant K=6?
Two 20-g ?atworms climb over a very thin wall, 10 cm high. One of the worms is 20 cm long, the other is wider and only 10 cm long. Which of them has done more work against grav
In a pool game a .17kg cue ball traveling at .75 m/s in the plus x direction hits a stationary eight ball. The eight ball moves off with velocity of .25 m/s at an angle of 37 degre
Peltier effect (J.C.A. Peltier; 1834) The change in temperature generated at a junction among two dissimilar metals or semiconductors while an electric current flow through the
The number of electrons in an atom of an element is equal to its: (1) Atomic weight (2) Atomic number (3) Equivalent weight (4) Electron affinity Ans: Atomic weigh
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A Balloon is inflated with Air by connecting it to a well insulated 100 L gas canister. Initially the air canister is at a pressure of P C1 = 9 MPa and at a temperature of T C1 =
Define about the Graphite Structure Graphite is the allotropic form of carbon. In case of graphite the carbon atoms are arranged in regular hexagons in flat parallel layers a
Describe capacitance or capacity of a conductor and illustrate the principle of capacitor. Derive the mathematical equation for equivalent capacitance (Capacity) When a number o
The atmospheric pressure at any position is numerically similar to the weight of a column of air of unit cross-sectional area extending from that position to the top of the atmosph
Define the Intensity of the laser in short. Intensity: a. Lasers are intense and bright light sources. It is due to coherence and directionality. b. The intensity is e
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