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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field. They will move along circular paths.
  • A
    of same radius
  • ✓
    with larger radii for the faster electrons
  • C
    with smaller radii for the faster electrons
  • D
    either $(b)$ or $(c)$ depending on the magnitude of the magnetic field
✓

Answer

Correct option: B.
with larger radii for the faster electrons
b
$r=\frac{m v}{q B} \Rightarrow r \propto v$

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