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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: - Consider the following two statements about Kirchhoff’s law
- Two particles P and Q start from origin and execute simple harmonic motion along X-axis
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- The Davisson- Germer experiment is the direct evidence of
- Two point charge +9e and +e are at 16 cm away from each other.
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Consider the following two statements about Kirchhoff’s law
- Two particles P and Q start from origin and execute simple harmonic motion along X-axis
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- The Davisson- Germer experiment is the direct evidence of
- Two point charge +9e and +e are at 16 cm away from each other.
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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