Question

The capacity of capacitor without dielectric is 3μF.If dielectric medium of dielectric constant 2 is introduce. What is the capacity of new capacitor?
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Answer 1

Answer:

Correct option is C)

Capacitance of a parallel capacitor with air is C=

d

ε

0

A

Capacitance of a same parallel plate capacitor with the introduction of a dielectric medium is C

′

=

d

Kε

0

A

where K is the dielectric constant of a medium

or

C

C

′

=KorK=

3

15

=5orK=

ε

0

ε

or ε=Kε

0

=5×8.854×10

−12

=0.44×10

−10

C

2

N

−1

m

−2