Electrostatics 1. When a nearby charged object causes a change in the distribution of charge on a neutral object, this is called an induced charge separation. Is it possible to create an induced charge separation on an insulator? On a conductor? Explain your answers. 2. The leaves of an electroscope will repel each other if you touch the electroscope with a positively charged glass rod. Use a series of charge diagrams to explain what happens and why the leaves repel each other. 3. Two neutral metal spheres on wood stands are touching. A negatively charged rod is held directly above the top of the left sphere, not quite touching it. While the rod is there, the right sphere is moved so that the spheres no longer touch. Then the rod is withdrawn. Afterward, what is the charge state of each sphere? Use charge diagrams to explain your answer. 4. Two identical metal spheres have different charges. One has a charge of +10 C and the other has a charge of 20 C. If the spheres are allowed to touch each other for a time and then are moved away from each other, what is the final charge on each sphere? Explain 5. A 1.8 g (0.0018 kg) pith ball is suspended from a thread and placed in an electric field. When placed in the electric field, the pith ball is deflected to the left so that the thread makes a 9.50 angle with the vertical. Calculate the electrostatic force on the pith ball. (0.0030 N) Charged rod Coulomb's Law and Electric forces 6. In a hydrogen atom, an electron is 5.29 x 10'11m from a proton. An electron has a charge of1.60 x 10' 19 C, and the proton's charge is +1.60 x 10'19 C. Calculate the electrostatic force of attraction acting on the two charges. (8.22 x 10-3 N [attraction]) 7. The electric force between two charged objects is 5.2 x 10\""1 N when the objects are 3.11 x 10'1 m apart. What is the electric force between the same objects if the distance is changed to 4.04 x 10'1 m? (3.1 x 10\"4 N) CBeLearn Physics 30 Module 3 Assignment September 2020 8. A metal sphere with a negative charge of 3.00 [LC is placed 12.0 cm from another similar metal sphere with a positive charge of 2.00 uC. The two spheres momentarily touch, and then return to their original positions. Calculate the electrostatic force acting on the two metal spheres. [1.56 x 10'1 N [repulsion]] 9. A metal sphere with a charge of -2.50 x 10'9 C is 1.50 cm to the left of a second metal sphere with a charge of +1.50 x 10'9 C. A third metal sphere of 1.00 x 10'9 C is situated 2.00 cm to the right of the second charged sphere. If all three charges form a line, determine the net electrostatic force on the second sphere. [1.16 x 10'4 N [left]] A B 10. From the diagram to the right determine the net -2.00 uC - 0.10 m +3.00 uC electrostatic force on the charge labeled C. [16.8 N at 12.60 W of S] 0.075 m C +4.00 uC 11. Two point charged objects produce an electric force of 0.0620 N on each other. What is the electric force if the distance between them increases three times and one of the charges is doubled? (0.0138 N) 12. In the diagram to the right, A has a charge of +0.30 uC, B has a charge of -0.20 uC and C has a charge of -0.20 uC. What is the net force on A? (0.093 N [S]) A 10 cm 10 cm B 10 cm