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CBSE Class 12-science Answered

please explain term velocity selector
Asked by vinodjoshi112233 | 12 Jun, 2017, 06:37: AM
answered-by-expert Expert Answer
-Velocity selector is a device consisting of perpendicular electric field (F = qE) and magnetic fields  (F = qvB) that can be used as a velocity filter for charged particles.
-Devices like electron microscopes and spectrometers use this principle for operating. 
-It is used in accelerator mass spectrometry to select particles based on their speed.
-Velocity selector segregates the particles such that the particles with the correct speed remain unaffected or undeflected while other particles will be deflected.
-Wilhelm Wien developed this phenomenon in the year 1898 for the study of anode rays and therefore velocity selector is also called Wien Selector. 
Answered by Abhijeet Mishra | 12 Jun, 2017, 11:32: AM

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CBSE 12-science - Physics
As we know, work done by Magnetic force is always zero in moving a charged particle./So it cannot change speed of charged particle. MY doubt is that, can magnetic force change direction of motion of charged particle?
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Asked by yashrajgharte24.12dgatl | 24 Sep, 2021, 04:21: PM
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CBSE 12-science - Physics
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What do you mean by magnetic Lorentz force?
Asked by Topperlearning User | 19 May, 2015, 09:44: AM
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When will be the force experienced by moving charge in a magnetic field maximum and minimum?
Asked by Topperlearning User | 19 May, 2015, 09:47: AM
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What is the work done by a magnetic field on a moving charge?
Asked by Topperlearning User | 19 May, 2015, 10:16: AM
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CBSE 12-science - Physics
In the expression, F= qvBsinθ  which pair of vectors among Syntax error from line 1 column 56 to line 1 column 97. Unexpected 'mathvariant'., begin mathsize 11px style straight v with rightwards arrow on top end style and begin mathsize 11px style straight B with rightwards arrow on top end style is always perpendicular to each other.
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CBSE 12-science - Physics
Deduce an expression for the force experienced by the moving charged particle in a uniform magnetic field?
Asked by Topperlearning User | 19 May, 2015, 10:57: AM
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CBSE 12-science - Physics
State the rule, which governs the direction of the magnetic Lorentz force.
Asked by Topperlearning User | 19 May, 2015, 11:00: AM
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