MHT CET · Physics · Semiconductors
In a CE transistor, a change of \(8.0 \mathrm{~mA}\) in the emitter current produces a change of \(7.8 \mathrm{~mA}\) in the collector current. What change in the base current is necessary to produce the same change in the collector current?
- A \(200 \mu \mathrm{A}\)
- B \(50 \mu \mathrm{A}\)
- C \(100 \mu \mathrm{A}\)
- D \(150 \mu \mathrm{A}\)
Answer & Solution
Correct Answer
(A) \(200 \mu \mathrm{A}\)
Step-by-step Solution
Detailed explanation
\(\Delta \mathrm{I}_{\mathrm{E}}=\Delta \mathrm{I}_{\mathrm{C}}+\Delta \mathrm{I}_{\mathrm{B}} \)
\( \Delta \mathrm{I}_{\mathrm{E}}=8 \mathrm{~mA}, \Delta \mathrm{I}_{\mathrm{C}}=7.8 \mathrm{~mA} \)
\( \therefore \Delta \mathrm{I}_{\mathrm{B}}=\Delta \mathrm{I}_{\mathrm{E}}-\Delta \mathrm{I}_{\mathrm{C}}=8-7.8=0.2 \mathrm{~mA}\) \(=200 \mu \mathrm{A}\)
\( \Delta \mathrm{I}_{\mathrm{E}}=8 \mathrm{~mA}, \Delta \mathrm{I}_{\mathrm{C}}=7.8 \mathrm{~mA} \)
\( \therefore \Delta \mathrm{I}_{\mathrm{B}}=\Delta \mathrm{I}_{\mathrm{E}}-\Delta \mathrm{I}_{\mathrm{C}}=8-7.8=0.2 \mathrm{~mA}\) \(=200 \mu \mathrm{A}\)
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
- What is the minimum energy required to launch a satellite of mass ‘m’ from the surface of the earth of mass ‘M’ and radius ‘R’ at an attitude 2R?MHT CET 2019 Medium
- When cell of E.M.F. ' \(E_1\) ' is connected to potentiometer wire, the balancing length is \(l_1\). Another cell of E.M.F. ' \(E_2\) ' \(\left(E_1 \gt E_2\right)\) is connected so that two cells oppose each other, then the balancing length is \(l_2\). The ratio \(\mathrm{E}_1: \mathrm{E}_2\) isMHT CET 2024 Hard
- A hollow cylinder has a charge ' \(q\) ' coulomb within it. If ' \(\phi\) ' is the electric flux in unit of V-m associated with the curved surface C, the flux linked with the plane surface 'A' in unit of V-m will be
\(\left[\epsilon_0=\right.\) permittivity of free space \(]\)
MHT CET 2025 Medium - A rectangular film of liquid is expanded from ( \(5 \mathrm{~cm} \times 4 \mathrm{~cm}\) ) to ( \(7 \mathrm{~cm} \times 8 \mathrm{~cm}\) ). If the work done is \(3 \times 10^{-4} \mathrm{~J}\), the surface tension of the liquid is (nearly)MHT CET 2025 Easy
- A bucket containing water is revolved in a vertical circle of radius ' \(\mathrm{r}^{\prime}\). To prevent the water from falling down, the minimum frequency of revolution required is
\([\mathrm{g}=\) acceleration due to gravity \(]\)MHT CET 2020 Medium - A thin rod of length \(\mathrm{L}\) has magnetic moment \(\mathrm{M}\) when magnetised. If rod is bent in a semicircular arc what is magnetic moment in new shape?MHT CET 2023 Medium
More PYQs from MHT CET
- A body executes SHM under the action of force ' \(F_1\) ' with time period ' \(\mathrm{T}_1\) '. If the force is changed to ' \(\mathrm{F}_2\) ', it executes SHM with period ' \(\mathrm{T}_2\) '. If both the forces ' \(\mathrm{F}_1\) ' and ' \(\mathrm{F}_2\) ' act simultaneously in the same direction on the body, its time period isMHT CET 2021 Hard
- Number of oxygen atoms present in salicylaldehyde areMHT CET 2020 Easy
- Which of the following salts turns red litmus blue in its aqueous solution?MHT CET 2023 Easy
- Calculate standard cell potential for a cell having following reaction,
\(2 \mathrm{Al}_{(\mathrm{s})}+3 \mathrm{Ni}^{2+} \rightarrow 2 \mathrm{Al}^{3+}+3 \mathrm{Ni}(\mathrm{s})\) \(\left(\mathrm{E}_{\mathrm{Ni}}^{\circ}=-0.25 \mathrm{~V}, \mathrm{E}_{\mathrm{A} 1}^{\circ}=-1.66 \mathrm{~V}\right)\)MHT CET 2022 Easy - Which of the following is NOT equivalent toMHT CET 2019 Easy
- On a photosensitive surface, if the intensity of incident radiation is increased, the stopping potentialMHT CET 2021 Easy