Six infinitely large and thin non-conducting sheets are fixed in configurations $I$ and $II$. As shown in the figure,the sheets carry uniform surface charge densities which are indicated in terms of $\sigma_0$. The separation between any two consecutive sheets is $d = 1 \mu m$. The various regions between the sheets are denoted as $1, 2, 3, 4$ and $5$. If $\sigma_0 = 9 \mu C / m^2$,then which of the following statements is/are correct: (Take permittivity of free space $\epsilon_0 = 9 \times 10^{-12} F / m$):

  • A
    In region $3$ of the configuration $II$,the magnitude of the electric field is $\frac{\sigma_0}{\epsilon_0}$.
  • B
    Potential difference between the first and the last sheets of the configuration $I$ is $3 V$.
  • C
    In region $4$ of the configuration $I$,the magnitude of the electric field is zero.
  • D
    Potential difference between the first and the last sheets of the configuration $II$ is zero.

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