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Describe the operation of a transistor amplifier in CE configuration.
Ans: Operation of a Transistor Amplifier in CE configuration: A Common Emitter NPN transistor is demonstrated in fig. (a). When a signal is applied in emitter-base junction, during positive half cycle, forward bias across this junction increases. This increases the flow of electrons from emitter to collector via base and hence increases the collector current. Increased collector current produces more voltage drop across the collector load resistor RC. Though, during negative half cycle of the signal, forward bias voltage across the emitter-base junction decreases. This decreases the collector current which consequently decreases the voltage drop across collector load resistor RC. Thus, an amplified signal appears across the collector load resistor.
Planck equation The quantum mechanical equation relating to the energy of a particular photon E to its frequency nu: E = h nu.
In the figure below the closed surfaces A and B appear as closed curves. Find the flux through closed surface B.
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