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Functions of the commutator:
A commutator is a device, which under certain conditions changes ac into dc and vice versa.
The commutator is a form of rotating switch placed between the armature and external circuit and so arranged that it reverses the links to the external circuits at the instant of every reversal of the current in the armature coil. Thus it changes induced alternating currents in armature coils into direct currents in the external load circuits.
Characteristics of a Transmitted Pulse The below animation depicts the boundary behavior of a pulse that is moving along a less dense incident and medium towards that is approa
what make flashlight suddenly become dim or bright when you shake it?
Explain and write about sonar
If a hydrogen atom in its ground state absorbs a photon with a wavelength of 93 nm, it jumps to an excited state. What is the value of the energy in that excited state?
Casimir effect (Casimir) A quantum mechanical effect, where two extremely large plates placed near to each other will experience an attractive force, in the absence of any oth
A standing wave is described by the wave function where x and y are in meters and t is in seconds. (a) Prepare graphs showing y as a function of x for five instants: t = 0, 5 ms,
What is waveguide dispersion in optical fibres? Waveguide dispersion (Δτ w ): Waveguide dispersion occurs because of the dependence onto the velocity of propagation of every
a 8 microfarad capacitor is charged to V=120V. the charging battery is then removed and the capacitor is connected in parallel to an uncharged 4 microfarad capapcitor. (a) what is
A packed parachute is dropped from rest from an airplane. A daredevil is launched straight down rom the plane 3.00s later. Neglecting air resistance, the daredevil catches up to th
Q) why we cant use the nuclear reactor concept in making fuel for our usages? Ans) Beacause nuclear reacters produse a huge energy which can''t be in our control and we can''t co
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