In Thomson's experiment, when the electron strikes the undeflected spot, then its moves with

In Thomson's experiment to determine e/m of an electron, it is found that an electron beam having kinetic energy of 45.5 eV remains undeflected, when subjected to crossed electric and magnetic fields. If E=1xx10^(3)Vm^(-1) , the value of B is (mass of the electron is 9.1xx10^(-31)kg )

In Thomson's experiment if the value of q/m is the same for all positive ions striking the photographic plate, then the trace would be

In Thomson's method of determining e/m of electrons

Electrons which have been accelerated by a potential difference of 1000 V enter co-terminus electric and magnetic fields of strengths 20 V//cm and 1 G respectively as in the Thomson's experiment. Estimate the e/m and the speed fo the electrons if they move undeviated through this system.

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