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If a slab of insulating material 4 xx 10...

If a slab of insulating material` 4 xx 10^(–5) `m thick is introduced between the plates of a parallel plate capacitor, the distance between the plates has to be increased by `3.5 xx 10^(–5)` m to restore the capacity to original value. Then the dielectric constant of the material of slab is

A

8

B

6

C

12

D

10

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