A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?
A. C1>C2
B. C2>C1
C. C1pa = C2pg
D. C1 = C2
Answer: Option D
Solution(By Examveda Team)
C1= capacitance of gold platesC2= capacitance of aluminium plates
rg= Gold’s resistivity
ra= Aluminium’s resistivity
As the capacitance depends on the shape, size & geometrical placing of the conductors & the medium between them, hence, the value of capacitance will be independent of resistivity. Therefore, C1= C2.
This Question Belongs to General Knowledge >> Physics
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