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Q1: A PN juncrion has to be reverse-biased for a transiton capacitance to exist. In forward bias there is no depletion layer and the junction conducts, so it does not behave as a capacitance.
Q2: In a common-emitter circuit the ouput voltage appears across a resistor connected between the collector and the positive rail (for a normal NPN transistor). Therefore when the current through the transistor increases, there is more voltage drop across this resistor and the collector voltage has to fall.
What else can I help you with?
Why does capacitance increase when the distance between the plates of a capacitor is increased?
you have it reversed. capacitance increases with decrease in distance of plates.
How do you decrease resonant frequency of a series-tuned circuit?
To decrease the resonant frequency of any tuned circuit, increase the inductance and/or increase the capacitance.
What would be the effective capacitance if two capacitors are connected in parallel?
A: the capacitance will increase. in series it will decrease accordingly CPARALLEL = Summation1-N (CN) CSERIES = 1 / Summation1-N (1 / CN)
What would happen if the length of wire increase what happens to the capacitance?
capacitance also increase
Why capacitance increase with a decrease in distance between plates?
Capacitance increases with a decrease in distance between plates because the electric field between the plates becomes stronger, storing more electric charge per unit voltage. This results in a higher capacitance value since the plates can hold more charge for the same applied voltage.
What will happen when a dielectric slab is inserted in the parallel plate capacitor?
(a) Charge Will increase (b) Potential difference will stay the same (c) Capacitance will increase (d) Stored energy will decrease
What should we do to increase the capacitance of a capacitor?
Not much if it is a fixed capaitor. If it is a variable capacitor, rotating the shaft to mesh the two sets of plates more closely will increase the capacitance.
What is increase or decrease for matter to change from one state into another?
An increase in temperature typically causes matter to change from a solid to a liquid or from a liquid to a gas. A decrease in temperature often results in the opposite transition, causing matter to change from a gas to a liquid or from a liquid to a solid.
In pn junction the depletion region capacitance increase with reverse bias or decrease?
any capacitance is given by equation C = (epsilon * A/ d) where d is distance between two plates, thus as d reduces C increases. Now, in depletion region as we increase reverse bias, the depletion region width increases. Now consider depletion region as a parallel plate capacitor, with positive charges on n side and negative charges on p side. Thus, as reverse bias increases, d of junction capacitance increases thus capacitance reduces. On other hand, as reverse bias reduces, d of junction capacitance reduces, thus capacitance increases. -Amey Churi
Doubling the plate area of a capacitor will?
increase the capacitance of the capacitor by a factor of two. This is because capacitance is directly proportional to the area of the plates.
Does x increase or decrease making the y increase or decrease?
no. :)
What is in the middle of decrease and increase?
The midpoint between decrease and increase is stability or equilibrium, where there is neither a decrease nor an increase occurring.
