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Three similar coils, each having a resistance of 8 and an inductive reactance of 8 are connected
(a) in star and
(b) in delta, across a 415V, 3-phase supply.
Measure for every connection the readings on each of two wattmeters connected to measure the power by the two-wattmeter method.
An infinitely long wire carries a current of three amps. The magnetic field outside the wire: a) Points radially away from the wire b) Points radially inward c) Circ
Disadvantages of D.C. Transmission of power 1. Electric power cannot be produced at high d.c. voltages because of commutation problem. 2. The d.c. voltage cannot be stepped
what is b.c.s theory?
Explain the meaning of Lasers? Lasers use these discrete energy levels in atoms or molecules to build a large population of atoms at an excited energy level that are ready and
Draw a graph showing the variation of binding energy per nucleon with mass number for dissimilar nuclei. Describe, with the help of this graph, the release of energy by the process
moving coil galvanometer
An electron moves perpendicular to Earth's magnetic field with a speed of 1.78 x 10 6 m/s. If the strength of Earth's magnetic field is about 5.00 x 10 -5 T. what is the
What is atomic holography? Atomic holography: Atomic holography has evolved out of the growth of the fundamental elements of atom optics. Along with the Fresnel diffraction
(i)Cathode waves always travel in straight path. (ii) Cathode rays exert mechanical force on the objects they strike. (iii) Cathode rays make fluorescence. (iv)
The current–voltage characteristic curve for a semiconductor diode as a function of temperature T is given by the equation i = i0(eev/kt - 1) Here the ?rst symbol e represen
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