At the same time, the lack of perfection suggests there are some possible sources of unmeasured and unwanted influence on the value of the charge-to-mass ratio. Careless error and systematic error are the two possible sources of influence in this experiment; observational errors due to a lack of brightness of the electron beam or other issues would fall under the category of careless error, while any lack of consistency or proper calibration in the apparatus would result in a systematic error.
Creating the proper environment for accurate observation, including darkening the room and using a high enough voltage in the magnetic coils (1500V) can create a situation where the electron beam is most visible, reducing the potential for careless error. Proper maintenance of the equipment being used in the experiment will help to ensure that systematic errors are reduced if not eliminated, though proper measurement and calibration remain necessary.
Regardless of the strength and the voltage intensity of the electric filed E, the electron beam remains uninfluenced. Slight curves are created in the beam due to the lack of complete uniformity in the magnetic field; as the beam interacts with the magnetic field at many points and at a certain volume in space, rather than at a single distinct point, variations in the magnetic field cause slight curves and shifts...
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