Two charges A (5.0 μC) and B (10 μC) are located at points (0 cm, 0 cm) and (-8 cm, -6 cm) respectively. The force exerted by charge B on charge A is (where î and ĵ are unit vectors along x-axis and y-axis respectively and [1 / 4πε0] = 9 × 109 Nm2/C2):

Which of the following statements are correct regarding electrostatic properties of conductors? A. Inside a conductor, the electrostatic field is zero. B. Electric field at the surface of a charged conductor does not depend on its surface charge density. C. The interior of a charged conductor can have no excess charge in static conditions. D. At the surface of a charged conductor, the electrostatic field must be normal to the surface at every point. E. The electrostatic potential is zero everywhere inside a charged conductor. Choose the correct answer:

What type of electric charge is acquired by a glass rod when it is rubbed with a silk cloth?