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The plates of a parallel plate capacitor are charged up to $200$ volts. A dielectric slab of thickness 4mm is inserted between the plates. Then, to maintain the same potential difference between the plates of the capacitor, the distance between the plates is increased by $3.2 m m$ . The dielectric constant of a dielectric slab is :
$1$
$4$
$5$
$6$

A

5

B

4

C

1

D

6

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