# A potential barrier of $$0.50$$ V exists across a $$\mathrm{p\text-n}$$ junction. If the depletion region is $$5.0\times10^{-7}~\text{m}$$ wide, the intensity of the electric field in this region is: 1. $$1.0 \times 10^6 ~\text{V/m}$$ 2. $$1.0 \times 10^5 ~\text{V/m}$$ 3. $$2.0 \times 10^5 ~\text{V/m}$$ 4. $$2.0 \times 10^6 ~\text{V/m}$$

Subtopic: Â PN junction |
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The current through an ideal $$\mathrm{p\text-n}$$ junction diode shown in the circuit will be:

 1 $$5$$ A 2 $$0.2$$ A 3 $$0.6$$ A 4 zero
Subtopic: Â PN junction |
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When a forward bias is applied to a $$\mathrm{p\text-n}$$ junction, then what happens to the potential barrier $$V_B,$$ and the width of charge depleted region $$x$$?
 1 $$V_B$$ increases, $$x$$ decreases 2 $$V_B$$ decreases, $$x$$ increases 3 $$V_B$$  increases, $$x$$ increases 4 $$V_B$$ decreases, $$x$$ decreases
Subtopic: Â PN junction |
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An LED is constructed from a $$\mathrm{p\text{-}n}$$ junction diode using $$\mathrm{GaAsP}$$. The energy gap is $$1.9~\text{eV}$$. The wavelength of the light emitted will be equal to:
1. $$10.4 \times 10^{-26} \text{m}$$
2. $$654~ \text{nm}$$
3. $$654~ \text{m}$$
4. $$654\times 10^{-11}~\text{m}$$

Subtopic: Â Applications of PN junction |
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NEET - 2019
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A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that $$V>V_z$$ then:

 1 all the current $$I_1, I_2~\text{and}~I_3$$ change. 2 only $$I_1$$ and $$I_2$$ change and $$I_3$$ remains constant. 3 only $$I_1$$ and $$I_3$$ change and $$I_2$$ remains constant. 4 all the currents remain constant.
Subtopic: Â Applications of PN junction |
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What is the reading of the ideal ammeters $$A_1$$ and $$A_2$$ connected in the given circuit diagram, if $$\mathrm{p\text-n}$$ junction diodes are ideal?

1. $$2$$ A and zero
2. $$3$$ A and $$2$$ A
3. $$2$$ A and $$3$$ A
4. zero and $$2$$ A

Subtopic: Â PN junction |
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Which of the following graphs may correctly represent the variation of current $$(I)$$ with potential difference $$(V)$$ across a zener diode?
 1 2 3 4
Subtopic: Â Applications of PN junction |
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The combination of gates shown in the diagram is equivalent to:

1. OR
2. AND
3. NAND
4. NOT

Subtopic: Â Logic gates |
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A Zener diode is used to obtain a constant voltage. If applied voltage $$\text V$$ changes, then:
($$\text V$$ is more than Zener voltage)

 1 $$i_{1}$$ and $$i_{2}$$ change. 2 $$i_{2}$$ and $$\text V_{0}$$ change and $$i_{3}$$ remains constant. 3 $$i_{2}$$ and $$\text V_{0}$$ don't change while $$i_{3}$$ changes. 4 $$i_{3}$$ and $$\text V_{0}$$ don't change while $$i_{2}$$ changes.
Subtopic: Â Applications of PN junction |
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In the given circuit, the power developed in $$2~\text{k}\Omega$$ resistor is:

1. $$36~\text{mW}$$
2. $$12~\text{mW}$$
3. $$144~\text{mW}$$
4. $$72~\text{mW}$$

Subtopic: Â Applications of PN junction |
Â 73%
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