1.

A parallel plate capacitor with air between the plates has a capacitance of 8pF (1 pF = 10^(-12)F). What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6 ?

Answer»

Solution :Here `C = 8 pF = (epsi_0A)/d`
Now `d. = d/2` and space is filled with a SUBSTANCE having K = 6. HENCE, new capacitance
`C.= (K epsi_0A)/(d.) = (6epsi_0A)/((d/2)) = 12 (epsi_0A)/d = 12 xx 8 pF-96 pF.`


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