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The I-V characteristic of a semiconductor diode in forward bias is a/an:

  • A.straight line
  • B.parabolic curve
  • C.exponentially decreasing curve
  • D.exponentially increasing curve
  • E.sinusoidal curve

Answer: D

The forward bias characteristic is an exponentially increasing curve.

The diode current follows \(I = I_{0}\left(e^{eV/kT} - 1\right)\). In forward bias, the current stays very small until the voltage approaches the barrier potential (about 0.7 V for silicon), and then rises steeply, growing exponentially with the voltage.

A straight line would mean an ohmic conductor, which the diode is not. The curve is not parabolic or sinusoidal, and it increases rather than decreases with forward voltage.

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