Electrostatics This is where the answers are located

An electrically neutral object can be attracted by a positively charged object because A. like charges repel each other B. the net charge in a closed system varies C. the neutral body becomes charged by contact D. the charges on a neutral body can be redistributed D

In the charging of a solid, charge transfer is accomplished by the displacement of A. both electrons and protons B. protons, only C. neither electrons nor protons D. electrons, only D

A positively charged object was used to give an electroscope a negative charge. The electroscope was charged by A. induction B. conduction C. contact D. reduction A

Coulombs 1 C = 6.241E18

The distance between an electron and a proton is varied The distance between an electron and a proton is varied. Which pair of graphs best represents the relationship between gravitational force, Fg, and distance, r, and the relationship between electrostatic force, Fe, and distance, r, for these particles? A. B. C. D. B

Two metal spheres having charges of +4. 0E–6 coulomb and +2 Two metal spheres having charges of +4.0E–6 coulomb and +2.0E–5 coulomb, respectively, are brought into contact and then separated. After separation, the charge on each sphere is A. 2.1E–6 C B. 8.0E–6 C C. 1.2E–5 C D. 8.0E–11 C C

A particle could have a charge of A. 8E–19 C B. 1. 2E–19 C C. 3 A particle could have a charge of A. 0.8E–19 C B. 1.2E–19 C C. 3.2E–19 C D. 4.1E–19 C C

Coulomb’s Law F = ke q1q2 d2

What is the magnitude of the electrostatic force between two electrons separated by a distance of 1.00E– 8 meter? A. 2.30E–12 N B. 2.30E–20 N C. 1.44E–1 N D. 2.56E–22 N A

A point charge of +3. 0E-7 coulomb is placed 2 A point charge of +3.0E-7 coulomb is placed 2.0E-2 meter from a second point charge of +4.0E-7 coulomb. The magnitude of the electrostatic force between the charges is A. 2.7 N B. 5.4E-2 N C. 3.0E-10 N D. 6.0E-12 N A

V = Work/q e-1 charge = -1.6023073E-19 Voltage V = Work/q e-1 charge = -1.6023073E-19

The energy required to move one elementary charge through a potential difference of 5.0 volts is A. 8.0 J B. 8.0E–19 J C. 1.6E–19 J D. 5.0 J B

Moving 2.5E–6 coulombs of charge from point A to point B in an electric field requires 6.3E–4 joules of work. The potential difference between points A and B is approximately A. 1.6E–9 V B. 4.0E–3 V C. 2.5E2 V D. 1.0E14 V C

Electric Field

Which diagram best represents the electric field near a positively charged conducting sphere? A. C. B. D. D

Which diagram best illustrates the electric field around two unlike charges? A. B. C. D.

An electron is located in an electric field of magnitude 600 Newtons per Coulomb. What is the magnitude of the electrostatic force acting on the electron? A. 9.60E–17 N B. 3.75E21 N C. 2.67E–22 N D. 6.00E2 N A

An electrostatic force of 20 Newtons is exerted on a charge of 8 An electrostatic force of 20 Newtons is exerted on a charge of 8.0E-2 Coulomb at point P in an electric field. The magnitude of the electric field intensity at P is A. 1.6 N/C B. 20. N/C C. 4.0E–3 N/C D. 2.5E2 N/C D

Extra

A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper A. may be positive or neutral B. must be negative C. must be positive D. may be negative or neutral A

Negatively charged rod A is used to charge rod B by induction Negatively charged rod A is used to charge rod B by induction. Object C is then charged by direct contact with rod B. The charge on object C is A. neutral B. positive C. negative B

An electric force F exists between two charged spheres An electric force F exists between two charged spheres. If the quantity of charge on each sphere is doubled, the electric-force between the two spheres will be equal to A. F/2 B. 2F C. 3F D 4F D

An object possessing an excess of 6 An object possessing an excess of 6.0E+6 electrons has a net charge of magnitude A. 5.5E–24 C B. 9.6E–13 C C. 2.7E–26 C D. 3.8E–13 C B

If an object has a net negative charge of 4 If an object has a net negative charge of 4.0 coulombs, the object possesses A. 6.3 10+18 more electrons than protons B. 6.3 10+18 more protons than electrons C. 2.5 10+19 more electrons than protons D. 2.5 10+19 more protons than electrons C

Two electrons are separated by a distance of 3. 00E–6 meter Two electrons are separated by a distance of 3.00E–6 meter. What are the magnitude and direction of the electrostatic forces each exerts on the other? A. 2.56E–17 N away from each other B. 7.67E–23 N away from each other C. 2.56E–17 N toward each other D. 7.67E–23 N toward each other A

The diagram below shows two metal spheres charged to +1 The diagram below shows two metal spheres charged to +1.0E-6 coulomb and +3.0E-6 coulomb, respectively, on insulating stands separated by a distance of 0.10 meter. The spheres are touched together and then returned to their original positions. As a result, the magnitude of the electrostatic force between the spheres changes from 2.7 N to A. 14 N B. 1.4 N C. 3.6 N D. 1.8 N C

The diagram represents an electron within an electric field between two parallel plates that are charged with a potential difference of 40.0 volts. If the magnitude of the electric force on the electron is 2.00 ×10–15 Newton, the magnitude of the electric field strength between the charged plates is 3.20E–34 N/C B. 2.00E–14 N/C C. 1.25E4 N/C D. 2.00E+16 N/C C