The charge and mass of an electron were determined by a combination of experiments by Sir Jo- seph John. You can change the magnitude of E and B to observe deflection of beam, the. Hence, the specific charge at the electron is determined if the values of E, B and V are known. The cathode-ray particles became known as electrons. In this case the direction of magnetic field is perpendicular to the direction of the motion of the charged particle. At this condition charge particle incident at point O at the fluorescent screen, If both magnetic and electric field are applied and their magnitude and direction is adjusted so that the charged particles move without deviation. In case of applying magnetic field only, the charge particle deviate and finally incident at 02 as shown in figure. Electron was discovered by J J Thomson by Cathode ray discharge tube experiment. When the charge particle moves under the action of electric field strength (E) it moves towards the +ve plate and finally incident at point O, at fluorescent screen. With the cathode ray tube, the cathode ejects electrons that are then accelerated through a charge, increasing their speed with each pass-through. When sufficient amount of potential (V) is applied between the two electrodes electrons emitted from the cathode accelerate with velocity āvā then, Cathode rays are invisible but their effect is to excite atoms in the glass opposite of the cathode, by the anode. It consists of discharge tube in which two electrodes anode (A) and cathode(C) are present P1 and P2 are two parallel electric plates to generate electric field strength (E). Both these precautions seem rarely to have been met in. Counts giving significant conclusions concerning killing rates can be obtained only if there is no clumping of the cells when spread and only if the cells are not allowed to multiply before irradiation. Thomson experiment to determine the specific charge of the electron. The differences in sensitivity to cathode rays shown by the bacteria studied can be explained by the purely physical factor of size. The experimental setup shown in the figure shows the modern J.J. IN this situation the direction of motion of electron remains perpendicular to both electric and magnetic field. The specific charge of an electron can be determined when electron moves in both magnetic field and electric field which are mutually perpendicular to each other so that the net force on the electron is made zero.
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