$A$ semiconductor device $X$ is connected in series with a battery and a resistor. $A$ current of $10 \ mA$ is found to pass through the circuit. If the terminals of $X$ are connected in reverse,the current drops to almost zero. $X$ may be

  • A
    a zener diode
  • B
    a p-n junction diode
  • C
    an intrinsic semiconductor
  • D
    an extrinsic semiconductor

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