JEE Main202522 Jan 2025Evening ShiftPhysicsMagnetic Effects of CurrentActual
An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is :
Options
- Ah eB
- B2 h e B
- Ch 2 e B
- D4 ~h e B
Correct answer
A. h eB
Step-by-step solution
m v r= n h 2 ...(i) r= v m B q ....(ii) aligned & n=2 & m r ( r B q m )= 2 h 2 & r= h B q & q=e & r= h B e aligned