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(B) $1$. The width of the depletion zone $(W)$ in a $PN$ junction is given by the formula $W = \sqrt{\frac{2\epsilon V_{bi}}{q} \left( \frac{N_A + N_D

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$B, C$ are true.

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(B) $1$. The width of the depletion zone $(W)$ in a $PN$ junction is given by the formula $W = \sqrt{\frac{2\epsilon V_{bi}}{q} \left( \frac{N_A + N_D}{N_A N_D} \right)}$,where $N_A$ and $N_D$ are the acceptor and donor dopant densities. Thus,the width is dependent on the densities of the dopants. Statement $(B)$ is true and $(A)$ is false.$2$. The depletion zone consists of fixed ionized dopant atoms (negative ions on the $p$-side and positive ions on the $n$-side). These fixed charges create an internal electric field across the junction. Thus,statement $(C)$ is true and $(D)$ is false.$3$. Therefore,statements $(B)$ and $(C)$ are correct.

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