This video lecture from Atomic Structure (F.Sc. First Year Chemistry) covers the experimental details of the J.J Thomson method of determining e/m value of electron in which the beam of electrons is made to fall at particular point by adjusting the values of magnetic and electric field and calculating the e/m value of electron. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.