InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A non-relative proton enters at right angles to a uniform magnetic field of `30 mT`. What is the frequency of revolution of the particle if the field is sufficiently deep? |
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Answer» Correct Answer - A::D |
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| 2. |
The forces of cathode ray particles due to electric and magnetic fields which are at right angles to each other balance each other. If the magnetic field has an intensity `0.1 T`, what is the intensity of the electric field? The velocity of cathode ray particles is `10^(6) m s^(-1)`. What p.d. is required to produce this velocity? |
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Answer» Correct Answer - A::B |
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| 3. |
A non-relativistic enters into a right-handed coordinate space with velocity `10^(4) m s^(-1)` at an angle of `60^(@)` with the x-axis in the xy-plane. There is a uniform magnetic field of 50 mT along the y-axis. Find the pitch of the helical trajectory. What is the axis of the helix? |
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Answer» Correct Answer - A |
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| 4. |
An electron falls through a potential difference of `50,000 V`. What is the energy acquired by it? |
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Answer» Correct Answer - A::D |
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| 5. |
In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each other and the intensity of the magnetic field is so adjusted that the beam remains undeflected. Show that the velocity of cathode ray particles is given by `v=E/B`. Calculate this velocity when `B=0.01 T` and `E=50,000 V//m`. |
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Answer» Correct Answer - A |
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| 6. |
A nonrelativistic electron enters a uniform magnetic field of 50 mT with a speed of `10^(6) m//s` at right angles to it and emerges from the field after `0.1` nanosecond. What is the deviation produced the field ? Show that it does not depend on the initial speed of the electron. |
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Answer» Correct Answer - A |
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| 7. |
An electron of energy 150 eV describes a circle in a magnetic field of 0.1 tesla. Calculate the radius of the curcle. |
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Answer» Correct Answer - A::D |
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| 8. |
Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is `1.7xx10^(11)C//kg`. The radius of the circular path will be |
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Answer» Correct Answer - A::B |
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| 9. |
A thick wire of radius `r=5 mm` carries a steady current `I=10 A`. An electron leaves its surface perpendicularly with velocity `v_(0)=10^(6) m//s`. Find the maximum distance from the surface of the wire before it turns back. |
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Answer» Correct Answer - A::B::C |
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| 10. |
An electron is moving with a velocity of `10^(7) m s^(-1)`. Find its energy in electron volts. (Mass of electron `=9.1xx10^(-31) kg` and charge of electron `=1.6xx10^(-19) C`) |
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Answer» Correct Answer - B::D |
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| 11. |
Electrons accelerated by a p.d. of `V=5000` volts are allowed to impinge normally on a plate. If the current constituted by the impinging electrons be `I=0.02 mA`, find the force experienced by the plate. Assume complete absorption of electrons by the plate. `m=9.0xx10^(-31) kg` and `e=1.6xx10^(-19) C` |
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Answer» Correct Answer - A::B::D |
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| 12. |
The resistivity of indium arsenide arsenide is `rho=2.5 xx10^(-3) Omega m` and its Hall constant is `C_(H)=10^(-2) m^(3)//c`. Find the concentration and mobility of the charge carriers in this material. |
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Answer» Correct Answer - A::B::C::D |
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