The ability of a capacitor to store electric charge between its plates is its capacity or capacitance. | |
DEFINITION | |
The capacitance of a capacitor is defined as: "The ratio of electric charge stored on any one of the plates of capacitor to potential difference between the plates." | |
Mathematically | |
C = Q / V | |
UNIT OF CAPACITANCE | |
In S.I. system unit of capacitance is Coulomb / volt OR Farad Farad is a large unit therefore in general practice we use small units (1) uF (microfarad) 1 uF = 1x10-6 F (2) uuF (Pico farad) 1 uuF = 1x10-12 F For latest information , free computer courses and high impact notes visit : www.citycollegiate.com | |
CAPACITANCE OF A PARALLEL PLATE CAPACITOR | |
Consider a parallel plate capacitor as shown below: | |
Let The area of each plate = A The separation between plates = d Medium = air Surface density of charge on each plate = s The electric field intensity between the plates of capacitor is given by | |
E = s / eo | |
Potential difference between the plates of capacitor can be calculated by the following relation | |
V = Ed Putting the value of "E" V = (s/eo) x d But s = Q/A V = Qd/A.eo AeoV = Qd…………(a) | |
We know that The electric charge stored on any one of plate of capacitor is | |
Q = CV……………(b) Putting the value of Q in (a) AeoV = CVd Cd = Aeo | |
C = Aeo/d (www.pak-physicsnotes.blogspot.com) | |
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