A pn junction is said to be reverse biased when
Correct answer: C. a potential difference is across it making the p-region negative and N-region positive
- A. no potential difference is applied across it
- B. a potential difference is applied across it making the p-region positive and N-region negative
- C. a potential difference is across it making the p-region negative and N-region positive
- D. a magnetic field is applied in the region of the junction
Explanation
A pn junction is said to be reverse biased when the p-type semiconductor is connected to the negative terminal of the battery and the n-type semiconductor is connected to the positive terminal. This arrangement increases the width of the depletion region and reduces the current flow across the junction.Incorrect Options and Explanations: (a) no potential difference is applied across it - This condition describes an unbiased junction. (b) a potential difference is applied across it making the p-region positive and N-region negative - This describes forward biasing. (d) a magnetic field is applied in the region of the junction - Magnetic fields are not commonly used to bias pn junctions.
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About Electronics
A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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