3. Two magnetically coupled coils are wound on a nonmagnetic core. The self- inductance of coil one is 288mH, the mutual inductance is 90mH, the coefficient of coupling is 0.75, and the physical structure of the coils is such that P11 = P22- a )Find L2 and the turns ratio N,/N, b) If N, = 1200, what is the value of P,and P,

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A: To find the voltage across resistance R1 in the circuit

Q: how to derive this formula?   Bdc= Ic/Ib=hFE

A: Derive the given formula: IB=IE1+β Where: IE= emitter current IB= Base  current IC= Collector…

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Q: = For the given figure, eo/ei

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A:

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).