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In forward bias the width of depletion l...

In forward bias the width of depletion layer in a p-n junction diode

A

Remains constant

B

Decreases

C

Increases

D

First (1) then(2)

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The correct Answer is:
B
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In p-n junction diode, near junction holes combine with electrons, and impurity ions form a barrier potential which opposes the recombination of electron-hole pairs. Value of barriers potential for Si is 0.7 volt and for Ge is 0.3 V. thus charge density at the junction becomes zero and an electric field is produced near junction. this region is called depletion layer. Thickness of depletion layer is of the order of 10^(-6) meter. in forward bias p terminal is connected with the positive terminal of cell and n is connected with negative terminal of cell and n is connected with negative terminal of cell. as forward voltage is increased, current increases exponentially. As forward voltage is increased barrier potential in p-n junction diode is A. increased B. Decreased C. remain same D. nothing can be said.

AAKASH INSTITUTE ENGLISH-SEMICONDUCTOR ELECTRONICS (MATERIAL, DEVICES AND SIMPLE CIRUITS )-Assignment section -C (Previous years type question)
  1. p-n junction diode can be used as

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  2. In p-type semiconductor, the major charge carriers are:

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  3. In forward bias the width of depletion layer in a p-n junction diode

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  4. Depletion layer consists of

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  5. In a junction diode, the holes are due to

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  6. In a PN junction : -

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  7. For the given circuit of P-N junction diode which is correct : -

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  8. Reverse bias applied to a junction diode

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  9. Barrier potential of a p-n junction diode does not depend on -

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  10. In a p–n junction photo cell, the value of the photo electromotive for...

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  11. In a zener diode, break down occurs in reverse bias due to

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  12. In a p-n junction, depletion region contains

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  13. In the given circuit , the value of current is

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  14. The diode used in the circuit shown in the figure has a constant volta...

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  15. The current in the circuit will be

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  16. If a full wave rectifier circuit is operating from 50 Hz mains, the fu...

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  17. The peak voltage in the output of a half wave diode rectifier fed with...

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  18. When a n-p-n transistor is used as an amplifier, then

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  19. An oscillator is nothing but an amplifier with

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  20. The correct relationship between the two current gains alpha and beta ...

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