MHT CET202013 Oct 2020Morning ShiftPhysicsMagnetic Effects of CurrentActual
An electron accelerated through potential difference ' V ' passes through a uniform transverse magnetic field and experiences a force ' F ^ . If the accelerating potential is increased to '2V', the electron in the same magnetic field will experience a force
Options
- A3 ~F
- BF
- C2 ~F
- DF 2
Correct answer
C. 2 ~F
Step-by-step solution
Kinetic energy k₁= eV and k₂=2 eV k ₂ k ₁ =2 v ₁ and v ₂ are the velocities in the two cases then aligned k ₂ k ₁ &= v ₂² v ₁² v ₂ v ₁ &= k ₂ k ₁ = 2 F ₂ ~F ₁ &= e ₂ ~B ev ₁ ~B = v ₂ v ₁ = 2 F ₂ &= 2 ~F ₁= 2 ~F aligned