Q. In Thomsons experiment of finding $e/m$ for electrons, beam of electron is replaced by that of muons (particles with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case is satisfied if
A) $B$ is increased 208 times
B) $E$ is increased 208 times
C) $B$ is increased 14.4 times
D) None of these
Explanation
(c) In the condition of no deflection $\frac{e}{m} = \frac{E^{2}}{2VB^{2}} \Rightarrow$ If $m$ is increased by 208 times than $B$ should be increased $\sqrt{208} = 14.4$ times
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.