| ⇦ | 
| ⇨ |
A beam of cathode rays is subjected to crossed Electric(E) and Magnetic fields(B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by: (Where V is the potential difference between cathode and anode).
Options
(a) B² / 2VE²
(b) 2VB² / E²
(c) 2VE² / B²
(d) E² / 2VB²
Correct Answer:
E² / 2VB²
Explanation:
For no deflection of beam, eE = evB ⇒ v = E/B
Also, 1/2 mv² = eV ⇒ v = E/B
e/m = v² / 2V = E² / 2VB²
Related Questions: - When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸,
- If the band gap between valence band and conduction band in a material is 5.0 eV,
- An inductor is connected to an a.c. source when compared to voltage,
- In a pure capacitive A.C circuit, current and voltage differ in phase by
- Two wheels having radii in the ratio 1:3 are connected by a common belt
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸,
- If the band gap between valence band and conduction band in a material is 5.0 eV,
- An inductor is connected to an a.c. source when compared to voltage,
- In a pure capacitive A.C circuit, current and voltage differ in phase by
- Two wheels having radii in the ratio 1:3 are connected by a common belt
Topics: Dual Nature of Matter and Radiation (150)
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
Thank you