AP EAMCET202421 May 2024Morning ShiftPhysicsMagnetic Effects of CurrentActual
When an electron placed in a uniform magnetic field is accelerated from rest through a potential difference V ₁ , it experiences a force F . If the potential difference is changed to V ₂ , the force experienced by the electron in same magnetic field is 2 F , then the ratio of potential differences V ₂ ~V ₁ is
Options
- A2: 1
- B1: 4
- C4: 1
- D1: 2
Correct answer
C. 4: 1
Step-by-step solution
K E = 1 2 mv ^2= eV v = 2 eV m Force on electron in magnetic field is aligned & F = eVB = e ( 2 eV ~m ) B ~F ~V & ~F ₂ ~F ₁ = V ₂ ~V ₁ ~V ₂ ~V ₁ = ( F ₂ ~F ₁ )^2= ( 2 ~F ~F )^2=4: 1 aligned