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Two parallel plates have equal and opposite charge. When the space between them is evacuated, the electric field between the plates is `2xx 10^(5)` V/m. When the space is filled with dielectric, the electric field becemes `1xx10^(5)` V/m. The dielectric constant of the dielectric material is

A

`1//2`

B

1

C

2

D

3

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