AP EAMCET · PHYSICS · Semiconductors
In a transistor, if the collector current is \(98 \%\) of emitter current, then the ratio of the base and collector currents is
- A \(1: 98\)
- B \(1: 1\)
- C \(1: 49\)
- D \(1: 99\)
Answer & Solution
Correct Answer
(C) \(1: 49\)
Step-by-step Solution
Detailed explanation
\(I_E = I_B + I_C\) \(I_C = 0.98 I_E \implies I_E = \frac{I_C}{0.98}\) \(I_B = I_E - I_C = \frac{I_C}{0.98} - I_C = I_C \left(\frac{1}{0.98} - 1\right)\) \(I_B = I_C \left(\frac{1 - 0.98}{0.98}\right) = I_C \left(\frac{0.02}{0.98}\right)\)…
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
- A man running at a speed of \(5 \mathrm{~km} / \mathrm{h}\), find that the rain falls vertically. When he stops running, he finds that the rain is falling at an angle of \(60^{\circ}\) with the horizontal. The velocity of rain with respect to running man isAP EAMCET 2015 Medium
- A gas is expanded from an initial state to a final state along a path that consists of (a) an isothermal expansion doing \(40 \mathrm{~J}\) work, (b) an adiabatic expansion doing \(\mathrm{W}\) work, (c) an isothermal expansion doing \(30 \mathrm{~J}\) work. If the total change in the internal energy of the gas is \(-20 \mathrm{~J}\), the work done by the gas during the adiabatic expansion \(\mathrm{W}=\)AP EAMCET 2023 Easy
- Two rectangular blocks of masses and are connected by a string and kept on a frictionless horizontal table. If a force of is applied on block away from block, then the tension in string isAP EAMCET 2022 Easy
- A open pipe of length \(l\) is vibrating in \(3 \mathrm{rd}\) overtone with maximum amplitude \(A\). The amplitude at a distance of \(\frac{l}{16}\) from any open end isAP EAMCET 2018 Easy
- The radius of Earth is about \(6400 \mathrm{~km}\) and that of Mars is \(3200 \mathrm{~km}\), and mass of the Earth is about 10 times mass of Mars. An object weight \(200 \mathrm{~N}\) on the surface of Earth. Then, its weight on the surface of Mars will beAP EAMCET 2021 Medium
- An object lying 100 cm inside water is viewed normally from air. If the refractive index of water is \(\frac{4}{3}\), then the apparent depth of the object isAP EAMCET 2024 Easy
More PYQs from AP EAMCET
- The general solution of the differential equation \(\frac{d y}{d x}+x y=4 x-2 y+8\) isAP EAMCET 2025 Medium
- Let \(a \neq 0\) and \(p(x)\) be a polynomial of degree greater than 2. If \(p(x)\) leaves remainders a and \(-a\) when divided respectively by \(x+a\) and \(x-a\), then the remainder when \(p(x)\) is divided by \(x^2-a^2\) is :AP EAMCET 2003 Medium
- [4]
Aqueous solution of an organic compound, ' \(A\) ' on electrolysis liberates acetylene and \(\mathrm{CO}_2\) at anode. ' \(A\) ' isAP EAMCET 2007 Easy - The difference between volume and pressure coefficients of an ideal gas isAP EAMCET 2005 Easy
- A box contains \(n\) coins, \(m\) of which are fair and the rest are biased. When a biased coin is tossed, the probability of getting a head is twice as likely as tail. A coin is drawn from the box at random and is tossed twice. It is found that first time it shows head and the second time it shows tail. Then, the probability that the coin drawn is fair isAP EAMCET 2021 Medium
- An electromagnetic wave of frequency \(45 \mathrm{MHz}\) travels in free space along \(X\)-axis. At some point and at some instant, the electric field has a maximum value of \(750 \mathrm{NC}^{-1}\) along \(Y\)-axis. The magnetic field at this position and time isAP EAMCET 2018 Easy