# Physics II Lab w answers_Part_18 - Therefore the total...

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47 Therefore the total displacement (y) in the spot position on the screen S due to the application of electric field between the plates VV / is y = CF + FO / = CF + BD ± ² ³ ´ µ + = L 2 a v m a E e y 2 0 ----------------------------------- (7) Thus ± ² ³ ´ µ + = L 2 a a E y v m e 2 0 ------------------------------------ (8) Hence, if the velocity of electron along the X-axis (v 0 ) is known, the value of (e/m) can be calculated. I.3 Let B be the magnetic field produced by the two bar magnets placed symmetrically on either side of the cathode ray tube at a distance d from it. The magnetic field of the bar magnets will be in the east- west direction. The magnetic force in the electron is given by ( ) B v e F × - = . This step up a force Bev 0 on the moving electron along the Y-direction. As a result, the electrons path becomes circular, with radius of curvature r given by 0 2 0 v e B r v m = -------------------------------------- (9) When the force on the electron beam due to crossed electric field and magnetic field

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Physics II Lab w answers_Part_18 - Therefore the total...

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