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Q. A capacitor blocks d.c. but allows a.c. Why?
Capacitive reactance XC = 1/ωC
= 1 / 2πνC
Where ν is the frequency of the a.c. supply.
In a d.c. circuit,ν = 0 ∴ XC = ∞
Thus a capacitor tenders infinite resistance to d.c. and blocks the d.c.
For an a.c., the capacitive reactance differs inversely as the frequency of a.c. and as well inversely as the capacitance of the capacitor.
Due to drift velocity of electrons and due to collision of electrons
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Q. What is dual character of light? Light behaves as particles of energy in the higher energy region as well as as waves in the lower energy region.
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