TS EAMCET · Physics · Semiconductors
Consider a \(p-n\) junction as a capacitor, formed with \(p\) and \(n\)-materials acting as thin metal electrodes and depletion layer width acting as separation between them. Basing on this, assume that a \(n-p-n\) transistor is working as an amplifier in CE configuration. If \(C_1\) and \(C_2\) are the base-emitter and collector-emitter junction capacitances, then :
- A \(C_1>C_2\)
- B \(C_1 < C_2\)
- C \(C_1=C_2\)
- D \(C_1=C_2=0\)
Answer & Solution
Correct Answer
(A) \(C_1>C_2\)
Step-by-step Solution
Detailed explanation
Base-emitter junction is forward biased, so its depletion width \(W_{BE}\) is small. Collector-base junction is reverse biased, so its depletion width \(W_{CB}\) is large. Capacitance \(C \propto \frac{1}{W}\). \(C_1\) (base-emitter capacitance) is large. \(C_2\)…
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
- Three rods of same dimensional have thermal conductivity \(3 K, 2 K\) and \(K\). They are arranged as shown in the figure below Then, the temperature of the junction in steady state is
TS EAMCET 2009 Easy - of liquid water at undergoes a phase change into steam at at atm (take it to be ). The initial volume of the liquid water was which is changed to of steam. Find the change in the internal energy of the system.
[Use heat of vaporization ]TS EAMCET 2022 Easy - Consider a rocket is being fired. The kinetic energy of the rocket is increased by times where as its total mass is reduced by half through the burning of fuel. The factor by which its momentum increases isTS EAMCET 2021 Medium
- A block of mass \(m=2 \mathrm{~kg}\) is initially at rest on a horizontal surface. A horizontal force \(\mathbf{F}_1=(6 \mathrm{~N}) \hat{\mathbf{i}}\) and a vertical force \(\mathbf{F}_2=(10 \mathrm{~N}) \hat{\mathbf{j}}\) are then applied to the block. The coefficients of static friction and kinetic friction for the block and the surfaces are 0.4 and 0.25 , respectively. The magnitude of the frictional force acting on the block is (assume, \(g=10 \mathrm{~m} / \mathrm{s}^2\) )
TS EAMCET 2020 Medium - A particle of mass \(4 \mathrm{~kg}\) is executing SHM. Its displacement is given by the equation \(y=8 \cos [100 t+\pi / 4] \quad \mathrm{cm}\). Its maximum kinetic energy isTS EAMCET 2015 Easy
- The displacement 's' of a body of mass \(3 \mathrm{~kg}\) under the action of a force is given by \(s=\frac{t^3}{3}\), where ' \(s\) ' is in metres and ' \(t\) ' is in seconds. The work done by the force in the first two seconds isTS EAMCET 2023 Medium
More PYQs from TS EAMCET
- An iron rod of length \(1.5 \mathrm{~m}\) lying on a horizontal table is pulled up form one end along a vertical line so as to move it with a constant velocity \(3 \mathrm{~m} / \mathrm{s}\), while the other end of the rod slides along the floor. After how much time the speed of the end sliding on the floor equals to the speed of the end being pulled up.TS EAMCET 2019 Medium
- The surface tension of 70 dynes \(/ \mathrm{cm}\) is equal toTS EAMCET 2020 Easy
- The resistance of a thermometer is \(100 \Omega\) at the triple point of water \((273 \mathrm{~K})\) ) and is \(300 \Omega\) at the melting point of gold \((-873 \mathrm{~K})\). The temperature at which the resistance of the thermometer is \(200 \Omega\) isTS EAMCET 2018 Easy
- Four electric charges \(2 \mu \mathrm{C}, \mathrm{Q}, 4 \mu \mathrm{C}\) and \(12 \mu \mathrm{C}\) are placed on \(x\)-axis at distances \(x=0\), \(1 \mathrm{~cm}, 2 \mathrm{~cm}\) and 4 cm respectively. If the net force acting on the charge at origin is zero, then \(\mathrm{Q}=\)TS EAMCET 2025 Medium
- When the temperature of a wire is increased from 303 K to 356 K , the resistance of the wire increases by \(10 \%\). The temperature coefficient of resistance of the material of the wire isTS EAMCET 2024 Easy
- In a transistor, the base current is \(10 \mu \mathrm{A}\) and the emitter current is \(1 \mathrm{~mA}\), then the collector current isTS EAMCET 2023 Medium