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What are eddy currents? State how their effect is decreased in transformers. (b) Verify the ef?ciency of a 15 kVA transformer for the following conditions: (i) full load, un
Centrifugal pseudoforce A pseudoforce which occurs while one is moving in consistent circular motion. One feels a "force" directed outward from the center of motion.
An open platform elevator is moving down a mine shaft.After the elevator has travelled 25m [from the top of the shaft]a stone is dropped from the top of the shaft .Find time taken
A particle with charge q and mass m is shot with K.E ''k'' into the region between two plates.If magnetic field between plates is B.How large B must be if the particle is to miss c
Q. Define critical temperature. The temperature at that electrical resistivity of the material suddenly drops to zero and the material changes from normal conductor to a super
Define about the Bell Jar? A vessel with a small hole of diameter d in it is delegate inside a high-vacuum chamber. The pressure is so low that the signify free path λ>> d.
Draw a schematic diagram of a single optical fibre structure. Describe briefly how an optical fibre is fabricated. Explain in brief, the mechanism of propagation of light signal by
What is radium used for? Radium was formerly used in self-luminous paints for nuclear panels, watches, aircraft switches, clocks, and instrument dials. More than 100 former wat
Fermi paradox (E. Fermi): E. Fermi's conjecture, simplified along phrase, "Where are they?" questioning that if the Galaxy is filled along with technological and intelligent c
Determine the HVL of photons in air, water, muscle, bone, and Pb for energies of 5 keV, 100 keV, 1 Mev and 100 MeV and then fill in the table below. Note that you must find the HVL
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