3. One balloon with 15,000 extra electrons is forced to touch an identical sized balloon with 3,000 extraelectrons.© 2023, Joanne C. Klouda, et. al, All Rights Reserveda. After the balloons reach static equilibrium (i.e. they share all excess charge equally), how many extraelectrons will each balloon have?b. What will be the charge on each balloon after they reach equilibrium?c. Will the balloons attract or repel each other? ATTRACT REPELd. If the balloons are 4 m apart, what is the magnitude of the electrostatic force they put on each other?

1. A boy rubs his dog with a balloon. The dog gets 20,000 extra electrons.a. What is the charge on the dog?b. Then the boy rubs a piece of silk on his cat. The cat LOSES 30,000 electrons to the silk. What is thecharge on the CAT?c. Finally, the boy places his cat (20 kg) on frictionless ice and he places his dog (35 kg) standing 2maway on the edge of the ice.i. Calculate the electrostatic force on the CAT from the DOG. Do they ATTRACT or REPEL?ii. What is the initial acceleration of the cat?iii. What is the electrostatic force on the DOG from the CAT? Why is this answer the same as ordifferent from “i”?iv. What is the initial acceleration of the dog? Why is this answer the same as or different from “ii”?

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +3.8 C? 2. How many electrons would be required to have a total charge of 1.00 C? 3. Two point charges are separated by 10.0 cm. If one charge is +20.0 C and the other is –6.00 C, what is the force between them? 4. Determine the electrostatic force of attraction between a proton and a electron that are separated by a distance of 5.0 x 102 nm. 5. Two identical point charges are 3.00 cm apart. Find the charge on each of them if the force of repulsion is 4.00 x 10–7 N. 6. Two identical point charges are separated by a distance of 3.0 cm and they repel each other with a force of 4.0 x 10–5 N. What is the new force if the distance between the point charges is doubled? 7. An electric force of 2.5 x 10–4 N acts between two small, equally charged spheres which are 2.0 cm apart. Calculate the force acting between the spheres if the charge on one sphere is doubled and the spheres move to a 5.0 cm separation. 8. Three particles are placed on a straight line. The left particle has a charge of +4.6 x 10-6 C, the middle particle has a charge of –2.3 x 10-6 C, and the right particle has a charge of –2.3 x 10-6 C. The particle on the left is 12 cm from the middle particle and the right particle is 24 cm from the middle particle. Find the total force on the middle particle. 9. Three charges are located on a straight line. A charge of +7.5 C is 0.4 cm from a –4.0 C charge. The –4.0 C charge is in turn 0.6 cm away from a +9.0 C charge. What is the net electric force on the middle (-4.0 C) charge? 10. Three charges are located in an equilateral triangle with sides of 0.5 m. The charge located at the top is +3.5C while the two bottom charges are +5.0 C and –5.0 C. What is the net electric force (magnitude and direction) acting on the top charge?

1 For coulomb force to be operative the least size of the atom will be a) 10ି଼ m b) 10ିଵହ m c) 10ିଵ଴ m d) 10ିଵଶ m 2 A conducting sphere of radius 10 cm is charged with 10 μC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are separated, then surface density of charges on the spheres will be in the ratio of a) 1: 1 b) 2: 1 c) 1: 3 d) 1: 2 3 When 10ଵଽ electrons are removed from a neutral metal plate, the electric charge on it is a) - 1.6 C b) 10ାଵଽ C c) +1.6 C d) 10ିଵଽ C 4 A charge q is placed at the center of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to a) ொ ହ b) ொ ଶ c) ொ ସ d) ିொ ସ 5 A parallel plate air capacitor is charged to a potential difference of V volt. After disconnecting the charging battery, the distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates. a) does not change b) increases c) becomes zero d) decreases 6 Which of the following is not the property of equipotential surfaces? a) They are concentric spheres for uniform electric fields. b) They can be imaginary spheres. c) They do not cross each other. d) Rate of change of potential with distance on them is zero.

Two charged spheres 10 cm apart attract each other with a force of 3.0 x 106 N. What forceresults from each of the following changes, considered separately?a) Both charges are doubled and the distance remains the same.b) An uncharged, identical sphere is touched to one of the spheres, and then taken far away.c) The separation is increased to 30 cm.

Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will beGroup of answer choicesF/2.F/4.2F.F.