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Three similar coils, each having a resistance of 8Ω and an inductive reactance of 8Ω are connected
(a) in star and
(b) in delta, across a 415V, 3-phase supply.
Calculate for every connection the readings on each of two wattmeters linked to measure the power by the two-wattmeter method
diagram
A guitar string produces 4 beats/second when sounded with a250Hz tuning fork and 9 beats/second when sounded with a 255 Hz tuning fork. What is the vibration frequency?
Why population inversion is essential to achieve in lasing action? a) Define zener breakdown. b) What is called nanomaterials?
The tree needs to fall uphill even though it is leaning downhill. The felling notch at O is sufficiently large so that the resisting moment at O is negligible. The trunk above po
A wheel is mounted on a stationary axle starts at rest and is given the following angular acceleration a =(9-12t) (SI units)where t is the time after the wheel begins to rotate.Fin
By what factor would the I 2 R loss in transmission wires be reduced if the transmission voltage were boosted from 220 V to 22 kV? Suppose that the rate of energy delivered is
Derive the Einstein Relation From the laws of thermodynamics, electrons carry a thermal energy equal to 1/2 kT per degree of freedom. Use this value to derive the Einstein's r
The energy band formed by a series of energy levels having valence electrons is called as valence band. At 0 K, the electrons fulfill the energy levels in valence band initialising
a tiny air bubble inside a glass slab appears to be 6 cm deep when viewed from one side and 4 cm deep when viewed from other side. find the thickness of slab
1. What do you understand by diffraction of waves? Explain why the diffraction of sound is more easily observable than the diffraction of light? 2. The wavelength of two spectra
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