Question

How many electrons does each inolecule contain il 15 000 of these molecules have a total charge of 24*1007 is browsit done to, but not touching cosphere on an insulated base. A second sphere, B, of the same shape, size and material carrying a car Describe what happens to the charges on spheres A and B as they are brought close together but not touching b. If we now remove sphere B, what is the charge on sphere A? c. How is the charge (if any) distributed? when 7. What would the electric force on charge Q be at each of the points shown in Figures

Answer 1

= 285 2.4 x 1015 Totel charge molecules of 1500 charge on one molecule = 2.4 x 10-15 1500 q = 0.0016 X10 le charge contains 1.6 xlole e election, 19 Ixlo elections. 1 charge contains electous = 16 so, q change contains lections n = dioolbXl0ls xl xlol et elections X 10" 1,6 = 0.0016 109 lub = 7.5 =lo eletons So, each morecinte Contains 10 elections.

sphere. A (uncharged) ttttt B sphere +8 XXX tt XXXX kuun lot NOT Touching each other iven that sphere A does not contain any charge. 0 and sphere B has on change to. (uniformity distributed over its surrfaree). When we take sphere B close to sphere A, then positive change on sphere B attract elections of sphere A towards it. and due to this process a difficiency of elections to accur on left side of sphere a. ( or we can say that charges are induced on surface I of sphere A as shown in ato above figure are to I electrostatic force on free elections of sphere A. And effect of this process on sphere ß is that charge density on left side of sphere B increases and charge density for on reight side decreases. Net charge on sphere, a I is now also equal to zero because there is no charge transfer take place,

16 Now, Again sphere B is removed. Then no force work on sphere A elections due to charge of sphere B. I So, elections again take their initial positions again, (due to internal repuision) And met charge on sphere À again becomes equal to zero. c) We know that sphere A was initially unchanged. So, no net chorrge on sphere A. So, no charge distribution take palace for sphere A. I After removing Sphere B / uncharged ta uniform charge density