Two point charges, initially 2.0 cm apart, experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what is the electric force between them?

Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?

Three identical point charges of 2.0 æC are placed on the x-axis. The first charge is at the origin, the second to the right at x = 50 cm, and the third is at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?

Electric field lines

A force of 6.0 N acts on a charge of 3.0 æC when it is placed in a uniform electric field. What is the magnitude of this electric field?

A 5.0-C charge is 10 m from a small test charge of 1.0 nC. What is the direction of the electric field at the 1.0 nC charge?

A 5.0-æC charge is placed at the 0 cm mark of a meterstick and a -4.0 æC charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?

A metal sphere of radius 10 cm carries a charge of +2.0 æC. What is the magnitude of the electric field 5.0 cm from the sphere's surface?

The net work done in moving an electron from point A, where the potential is -50 V, to point B, where the potential is +50 V, is

Starting from rest, a proton falls through a potential difference of 1200 V. What speed does it acquire?

For an electron moving in a direction opposite to the electric field

How much work does 9.0 V do in moving 8.5X1018 electrons?

A uniform electric field, with a magnitude of 500 V/m, is directed parallel to the +x axis. If the potential at x = 5.0 m is 2500 V, what is the potential at x = 2.0 m?

The absolute potential at a distance of 2.0 m from a negative point charge is -100 V. What is the absolute potential 4.0 m away from the same point charge?

The absolute potential at the center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is the absolute potential at the square's center when a second charge of -Q is placed at one of the remaining corners?

A parallel-plate capacitor consists of plates of area 1.5X10-4 m2 and separated by 1.0 mm. The capacitor is connected to a 12-V battery. What is the charge on the plates?

A parallel plate capacitor is constructed with plate area of 0.40 m2 and a plate separation of 0.10 mm. How much charge is stored on it when it is charged to a potential difference of 12 V?

A parallel plate capacitor is constructed with plate area of 0.40 m2 and a plate separation of 0.10 mm. How much energy is stored?

A 15-æF capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric that completely fills the space between the plates is inserted. If the dielectric has a dielectric constant of 5.0, what is the capacitance of the capacitor after the slab is inserted?

A 15-æF capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric that completely fills the space between the plates is inserted. If the dielectric has a dielectric constant of 5.0, what is the voltage across the capacitor's plates after the slab is inserted?