In your experiment, a charged ball of m= 100 g is suspended in place by a string at an angle theta from the y-axis (as shown in figure). A unform electric field is ponting to the right in the x-direction. Gravity acts down in the y-direction. In order for this situation to be possible in your experiment, what must the charge of the ball be?   a. positive b. negative c. neutral

Which of the following is TRUE about electric field lines? A. The density of field lines at a point is proportional to the magnitude of the field at that point. B. In a region of greater electric field strength, the lines are farther apart. C. The number of field lines entering and leaving a charge is proportional to the charge's sign. D. Electric field lines begin on a negative charge and ends on a positive charge.

A conducting sphere is intially neutally charged. Its grounded, meaning the sphere has a direct path to earth ground. Which of the following describes the flow of electrons when a positvely charged rod is broght near the sphere? a. Electrons flow within the sphere but do not go into or out of the ground. b. Electrons flow out of the ground and into the sphere. c. Electrons flow out of the sphere and into the ground. d. There is no flow of electrons.

After a glass rod is rubbed with silk, it is observed to have a net charge of +24 nC. Which of the following statements correctly describes the interaction between the silk and the rod? A. The rod transferred 1.5 x1011 electrons to the silk. B. The rod transferred 1.5 x1011 protons to the silk. C. The silk transferred 1.5 x1011 electrons to the rod. D. The silk transferred 1.5 x1011 protons to the rod.

a. Two charges are separated by a distance of 5.0 cm. q1 has a charge of 4.0x10^-6 C and q2 has a charge of 2.8x10^-7 C. Locate the point(s) where a positive test charge could be placed to keep it in equilibrium.b. Sketch the electric field lines for this system of charges (*The screenshot diagram*).

If, in Step 5, Spheres A and C are separated by a distance of r = 2.0 m and q = 1.0 C, determine the magnitude of the electrostatic force between Spheres A and C.

A short copper rod has a neutral charge. Negative charges are then applied to the right end of the rod. Which of the following describes the charge on the copper rod 5 s later? A. Both ends of the rod have a positive charge. B. The negative charge is spread evenly along the rod. C. Only the right end of the rod has a negative charge. D. All of the positive charge is in the middle of the rod. The diagram below shows two electric charges, -q and +q, separated by a distance, d. +q -q d What happens to the electric force between the charges if the magnitude of each charge is doubled? A. It becomes 16 times less. B. It becomes 2 times less. C. It becomes 4 times greater. D. It becomes 8 times greater. What is the primary difference between insulators and conductors? A. Electrons are present in insulators but not in conductors. B. Electrons are present in conductors but not in insulators. C. Electrons are free to move in insulators but not in conductors. D. Electrons are free to move in…