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Question

A parallel plate capacitor of capacitance 6μF in air and 60μF. When dielectric is introduced. What is the dielectric constant of the medium.?

A
0.4
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B
0.1
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C
0.77
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D
0.25
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Solution

The correct option is A 0.1
Capacitance in air, C=6μF
Capacitance in Dielectric, c=60μF
Capacitance of parallel plate capacitor is increased by insertion of a dielectric medium by 'k' times.
where k= Dielectric constant
C=E0D, C=kE0D
c=kC
or k=Cc
k=660=0.1.


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