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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: - Light of wavelength 500 nm is incident on a metal with work function 2.28 eV.
- The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio
- Two identical capacitors each of capacitance 5 mF are charged potentials 2 kV and 1 kV
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Light of wavelength 500 nm is incident on a metal with work function 2.28 eV.
- The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio
- Two identical capacitors each of capacitance 5 mF are charged potentials 2 kV and 1 kV
- An engine has an efficiency of 1/6. When the temperature of sink is reduced
- When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid
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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