| ⇦ | 
| ⇨ |
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field B. If V and B are kept constant, the ratio ( charge on the ion / mass of the ion) will be proportional to
Options
(a) 1/R²
(b) R²
(c) R
(d) 1/R
Correct Answer:
1/R²
Explanation:
In mass spectrometer, when ions are accelerated through potential V
1/2 mv² = qV …..(i)
As the magnetic field curves the path of the ions in a semiciruclar orbit
Bqv = mv² / R v = BqR / m ….(ii)
Substituting (ii) and (i)
1/2 m[ BqR / m]² = qv or q/m = 2V / B²R²
Since V and B are constants, q/m ∞ 1/R²
Related Questions:
- Coherent sources are those sources for which
- If the density of earth is doubled keeping its radius constant then acceleration
- The ratio of the radii or gyration of a circular disc to that of a circular ring
- Four identical rods are joined to from a square. If the temperature difference
- A comb run through one’s dry hair attracts small bits of paper. This is due to
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply