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Electronic Devices question

2009 · Shift 0 · Q49
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Electronic Devices question

2009 · Shift 0 · Q49

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
A ppp-nnn junction (D)(D)(D) shown in the figure can act as a rectifier. An alternating current source (V)(V)(V) is connected in the circuit. AIEEE 2009 Physics - Semiconductor Question 194 English The current (I)(I)(I) in the resistor (R)(R)(R) can be shown by :
  1. A
    AIEEE 2009 Physics - Semiconductor Question 194 English Option 1
  2. B
    AIEEE 2009 Physics - Semiconductor Question 194 English Option 2
  3. C
    AIEEE 2009 Physics - Semiconductor Question 194 English Option 3
  4. D
    AIEEE 2009 Physics - Semiconductor Question 194 English Option 4
View written solutionFree

Correct answer: B

  1. Identify the circuit behavior

A ppp-nnn junction diode acts as a rectifier because it allows current mainly in one direction:

  • Forward bias: diode conducts
  • Reverse bias: diode blocks current

So, when an AC source is connected in series with a diode and resistor, the current through the resistor is not alternating fully. It flows only during one half-cycle.

  1. Nature of output current through RRR

For an input alternating voltage:

V=V0sin⁡ωtV = V_0 \sin \omega tV=V0​sinωt

The diode conducts only when it is forward biased. Therefore, current in RRR exists only for one half of the AC cycle and is zero for the other half.

Hence the current waveform is a half-wave rectified current.

  1. Choose the correct graph

The correct option must show:

  • current only during positive half cycles (or only during negative half cycles depending on diode orientation),
  • zero current during the opposite half cycles.

Among the given options, this corresponds to Option B.

  1. Final answer

Thus, the current in the resistor is represented by the half-wave rectified waveform.

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