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Three pithballs are suspended from thin threads. Variousobjects are then rubbed against other objects (nylon againstsilk, glass against polyester, etc.) and each of the pithballs ischarged by touching them with one of these objects. It isfound that pithballs 1 and 2 repel each other and thatpithballs 2 and 3 repel each other. From this we canconclude that 1. 1 and 3 carry charges of opposite sign. 2. 1 and 3 carry charges of equal sign. 3. all three carry the charges of the same sign. 4. one of the objects carries no charge. 5. we need to do more experiments to determine the sign of the charges.
Three pithballs are suspended from thin threads. Variousobjects are then rubbed against other objects (nylon againstsilk, glass against polyester, etc.) and each of the pithballs ischarged by touching them with one of these objects. It is foundthat pithballs 1 and 2 attract each other and that pithballs 2 and3 repel each other. From this we can conclude that1. 1 and 3 carry charges of opposite sign.2. 1 and 3 carry charges of equal sign.3. all three carry the charges of the same sign.4. one of the objects carries no charge.5. we need to do more experiments to determine the sign of thecharges.
A hydrogen atom is composed of a nucleus containing asingle proton, about which a single electron orbits. Theelectric force between the two particles is 2.3 x 10
39 greater than the gravitational force! If we can adjust the distancebetween the two particles, can we find a separation at whichthe electric and gravitational forces are equal? 1. Yes, we must move the particles farther apart. 2. Yes, we must move the particles closer together. 3. No, at any distance
Two uniformly charged spheres are firmly fastened to andelectrically insulated from frictionless pucks on an air table.The charge on sphere 2 is three times the charge onsphere 1. Which force diagram correctly shows themagnitude and direction of the electrostatic forces:
