In J.J. Thomson e/m experiment, a beam of electron is replaced by that of muons (particle with same charge as that of electrons but mass 208 times that of electrons). No deflection condition is achieved only if

Options

A. B is increased by 208 times
B. B is decreased by 208 times
C. B is increased by 14.4 times
D. B is decreased by 14.4 times

Answer

c

Explanation

In the condition of no deflection `(e)/(m)=(E^(2))/(2vB^(2))`
If m is increased by 208 times then B should be increased `sqrt(298)=14.4` times.