JEE Mains · Physics · STD 12 - 14. Semicondutor electronics
A zener diode of power rating \(2\, {W}\) is to be used as a voltage regulator. If the zener diode has a breakdown of \(10 \,{V}\) and it has to regulate voltage fluctuated between \(6\, {V}\) and \(14\, {V}\), the value of \({R}_{{s}}\) for safe operation should be \(....\Omega\)
- A \(10\)
- B \(20\)
- C \(15\)
- D \(25\)
Answer & Solution
Correct Answer
(B) \(20\)
Step-by-step Solution
Detailed explanation
When unregulated voltage is \(14\, {V}\) voltage across zener diode must be \(10\, {V}\) So potential difference across resistor \(\Delta {V}_{{Rs}}=4\, {V}\) and \({P}_{\text {zener }}=2\, {W}\) \({VI}=2\) \({I}=\frac{2}{10}=0.2\, {A}\) \(\Delta {V}_{{Rs}}={I} {R}_{{s}}\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- If earth has a mass nine times and radius twice to the of a planet \(P\). Then \(\frac{v_e}{3} \sqrt{x}\; ms ^{-1}\) will be the minimum velocity required by a rocket to pull out of gravitational force of \(P\), where \(v_e\) is escape velocity on earth. The value of \(x\) isJEE Mains 2023 Medium
- A plane electromagnetic wave with frequency of \(30 {MHz}\) travels in free space. At particular point in space and time, electric field is \(6 {V} / {m}\). The magnetic field at this point will be \({x} \times 10^{-8} {T}\). The value of \({x}\) is ..... .JEE Mains 2021 Medium
- Consider a rectangular sheet of solid material of length \(\ell=9 \mathrm{~cm}\) and width \(\mathrm{d}=4 \mathrm{~cm}\). The coefficient of linear expansion is \(\alpha=3.1 \times 10^{-5} \mathrm{~K}^{-1}\) at room temperature and one atmospheric pressure. The mass of sheet \(\mathrm{m}=0.1 \mathrm{~kg}\) and the specific heat capacity \(\mathrm{C}_{\mathrm{v}}=900 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}\). If the amount of heat supplied to the material is \(8.1 \times 10^2 \mathrm{~J}\) then change in area of the rectangular sheet is :-JEE Mains 2025 Easy
- The ratio of vapour densities of two gases at the same temperature is \(\frac{4}{25}\), then the ratio of r.m.s. velocities will be:JEE Mains 2025 Easy
- A rod of mass \(M\) and length \(L\) is lying on a horizontal frictionless surface. A particle of mass ' \(m\) ' travelling along the surface hits at one end of the rod with velocity \('u'\) in a direction perpendicular to the rod. The collision is completely elastic. After collision, particle comes to rest. The ratio of masses \(\left(\frac{m}{M}\right)\) is \(\frac{1}{x}\). The value of ' \(x\) ' will be ..... .JEE Mains 2021 Hard
- Given below are two statements: Statement \(I:\) Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface. Statement \(II:\) Acceleration due to earth's gravity is same at a height ' \(h\) ' and depth ' \(d\) ' from earth's surface, if \(h = d\). In the light of above statements, choose the most appropriate answer form the options given belowJEE Mains 2023 Medium
More PYQs from JEE Mains
- Between the following two statements : Statement \(-I\) : Let \(\overrightarrow{\mathrm{a}}=\hat{\mathrm{i}}+2 \hat{\mathrm{j}}-3 \hat{\mathrm{k}}\) and \(\vec{b}=2 \hat{i}+\hat{j}-\hat{k}\). Then the vector \(\vec{r}\) satisfying \(\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{r}}=\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}\) and \(\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{r}}=0\) is of magnitude \(\sqrt{10}\). Statement \(-II\) : In a triangle \(A B C, \cos 2 A+\cos 2 B\) \(+\cos 2 \mathrm{C} \geq-\frac{3}{2}\)JEE Mains 2024 Hard
- The region represented by \(\{z=x+i y \in C:|z|-\operatorname{Re}(z) \leq 1\}\) is also given by the inequalityJEE Mains 2020 Hard
- Consider a hyperbola \(H : x ^{2}-2 y ^{2}=4\). Let the tangent at a point \(P (4, \sqrt{6})\) meet the \(x\) -axis at \(Q\) and latus rectum at \(R \left( x _{1}, y _{1}\right), x _{1}>0 .\) If \(F\) is a focus of \(H\) which is nearer to the point \(P\), then the area of \(\Delta QFR\) is equal to ....... .JEE Mains 2021 Hard
- The equation of one of the straight lines which passes through the point \((1,3)\) and makes an angles \(\tan ^{-1}(\sqrt{2})\) with the straight line, \(y+1=3 \sqrt{2} x\) isJEE Mains 2021 Hard
- If \(y(x)=\left(x^{x^{x}}\right), x>0\) then \(\frac{d^{2} x}{d y^{2}}+20\) at \(x=1\) is equal toJEE Mains 2022 Hard
- Let \( f(x)=\int\frac{(2-x^{2})e^{x}}{(\sqrt{1+x})(1-x)^{\frac{3}{2}}}dx \). If \( f(0)=0 \), then \( f(\frac{1}{2}) \) is equal to:JEE Mains 2026 Easy