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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.
Voltmeter: An electromechanical instrument which is used to calculate potential difference among two points is known as voltmeter. Voltmeter is a modified form of a galvanom
what is radiation
Q. What is acceptor circuit ? Give the uses of it. Acceptor circuit The series resonant circuit is frequently called an acceptor circuit. By proffering minimum impedan
A commuter train blows its horn as it passes a passenger platform at a constant speed of 40.0m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest. (a) W
Two concentric conducting shells a and b are of radii R and 2R. A charge +q is centred at their center. Shell b is then earthed and a is given charge q. Find the charge on outer su
Question: Is it probable for the electric field to be zero in a region of space where the electric potential is not zero? Answer: Only if the electric potential has on
What is coulmb''s law
lumen; lm: The derived SI unit of luminous flux, described as the luminous flux emitted through a uniform point source of 1 cd emitting its luminous energy on a solid angle of
The speed at which a wave propagates down a string is 300 meters per second. If the frequency of this wave is 150 Hertz, what is the wavelength of this wave? Ans: The wavel
Essential properties of the medium for wave propagation: (i) Elasticity: So that particle can return to their mean position, after having been disturbed. (ii) Inertia : So t
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