A) \[\frac{mV}{Be}\]
B) \[\frac{me}{B}\]
C) \[\frac{mE}{B}\]
D) none of these
Correct Answer: A
Solution :
As the centripetal force on an electron is \[=\frac{m\,{{V}^{2}}}{r}\] ?..(i) (where r is the radius of circular path) and force on a moving charge in the magnetic field is \[=BeV\] ......(ii) Equating (i) and (ii), we get. \[\frac{m{{V}^{2}}}{r}=BeV\] \[\Rightarrow \] \[r=\frac{mV}{Be}\]You need to login to perform this action.
You will be redirected in
3 sec