Two isolated conducting spheres and of radius and have and charges, respectively, and are at a large distance from each other, They are now connected by a conducting wire. A long time after this is done the charges on and are respectively:
Two identical conducting spheres A and B carry equal charge. They are initially separated by a distance much larger than their diameters and the force between them is F. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to C and removed. As a result, the force between A and B now is
A metal rod A is to be charged positively by using another charged rod B. What should be the kind of charge on rod B if charging is to be done by conduction?
An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?
(a) Inflated rubber balloon (b) Woollen cloth (c) Ballpoint pen refill (d) Polythene bag
Figure below shows a metal rod AB placed on an insulating stand. In figure (a) a negatively charged ebonite rod C is touched with the metal rod AB, while in figure (b), the negatively charged ebonite rod C is held near the rod AB. State the kind of charges at the ends A and B of the rod, in each case.
A plastic comb is rubbed with dry hair whereas a glass rod is rubbed with a piece of silk cloth. Which of these will get negatively charged?
(a) Plastic comb (b) Glass rod (c) Dry hair (d) Silk cloth
