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(D) $p-n$ junction diode acts as a rectifier,which allows current to flow in only one direction.When the $p$-region is connected to the positive termi

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a $p-n$ junction

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(D) $p-n$ junction diode acts as a rectifier,which allows current to flow in only one direction.When the $p$-region is connected to the positive terminal of the battery and the $n$-region to the negative terminal,the diode is in forward bias,and current flows through the circuit.When the polarity of the battery is reversed,the $p$-region is connected to the negative terminal and the $n$-region to the positive terminal. This is reverse bias,where the depletion region widens,and practically no current flows through the circuit.

When a semiconducting device is connected in series with a battery and a resistance,a current is found to flow in the circuit. If,however,the polarity of the battery is reversed,practically no current flows in the circuit. The device may be

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