4. Two magnetically coupled coils have self-inductances of 60mH and 9.6mH, respectively.The mutual inductance between the coils is 22.8mH a) What is the coefficient of coupling? b) For these two coils, what is the largest value that M can have? c) Assume that the physical structure of these coupled coils is such that P, = P2 What is the turns ratio N1/N2 if N, = 60mH? %3D

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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).