ElectrostaticsElectrostatics

An electrically neutral object can be An electrically neutral object can be attracted by a positively charged object attracted by a positively charged object becausebecauseA. like charges repel each otherA. like charges repel each otherB. the net charge in a closed system B. the net charge in a closed system variesvariesC. the neutral body becomes charged C. the neutral body becomes charged by contactby contactD. the charges on a neutral body can be D. the charges on a neutral body can be redistributedredistributed

In the charging of a solid, charge In the charging of a solid, charge transfer is accomplished by the transfer is accomplished by the displacement ofdisplacement ofA. both electrons and protonsA. both electrons and protonsB. protons, onlyB. protons, onlyC. neither electrons nor protonsC. neither electrons nor protonsD. electrons, onlyD. electrons, only

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

CoulombsCoulombs1 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 Which pair of graphs best represents the relationship between gravitational force, between gravitational force, FgFg, and distance, , and distance, rr, and the , and the relationship between electrostatic force, relationship between electrostatic force, FeFe, and , and distance, distance, rr, for these particles? , for these particles?

A.A. B. B.

C. C. D. D.

Two metal spheres having charges of Two metal spheres having charges of +4.0E–6 coulomb and +2.0E–5 coulomb, +4.0E–6 coulomb and +2.0E–5 coulomb, respectively, are brought into contact and respectively, are brought into contact and then separated. After separation, the charge then separated. After separation, the charge on each sphere ison each sphere is

A. 2.1E–6 C A. 2.1E–6 C

B. 8.0E–6 C B. 8.0E–6 C

C. 1.2E–5 C C. 1.2E–5 C

D. 8.0E–11 CD. 8.0E–11 C

A particle could have a A particle could have a charge ofcharge ofA. 0.8E–19 C A. 0.8E–19 C B. 1.2E–19 C B. 1.2E–19 C C. 3.2E–19 C C. 3.2E–19 C D. 4.1E–19 CD. 4.1E–19 C

Coulomb’s LawCoulomb’s LawF = ke q1q2

d2

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

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

VoltageVoltageV = Work/q

e-1 charge = -1.6023073E-19

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

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 approximatelyA. 1.6E–9 V B. 4.0E–3 V C. 2.5E2 V D. 1.0E14 V 

Electric FieldElectric Field

Which diagram best represents the electric field near a Which diagram best represents the electric field near a positively charged conducting sphere?positively charged conducting sphere?

A.A. C.C.

B.B. D.D.

Which diagram best illustrates the electric field around Which diagram best illustrates the electric field around two unlike charges?two unlike charges?

A. A. B. B.

C. C. D. 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

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 isA. 1.6 N/C B. 20. N/C C. 4.0E–3 N/C D. 2.5E2 N/C

ExtraExtra

A negatively charged plastic comb is A negatively charged plastic comb is brought close to, but does not touch, a brought close to, but does not touch, a small piece of paper. If the comb and small piece of paper. If the comb and the paper are attracted to each other, the paper are attracted to each other, the charge on the paperthe charge on the paperA. may be positive or neutralA. may be positive or neutralB. must be negativeB. must be negativeC. must be positiveC. must be positiveD. may be negative or neutralD. may be negative or neutral

Negatively charged rod Negatively charged rod A A is used is used to charge rod to charge rod B B by induction. by induction. Object Object C C is then charged by is then charged by direct contact with rod direct contact with rod BB. The . The charge on object charge on object C C is is A. neutralA. neutralB. positiveB. positiveC. negativeC. negative

An electric force An electric force F F exists between two exists between two charged spheres. If the quantity of charged spheres. If the quantity of charge on each sphere is doubled, the charge on each sphere is doubled, the electric-force between the two spheres electric-force between the two spheres will be equal towill be equal toA. F/2A. F/2B. 2FB. 2FC. 3FC. 3FD 4FD 4F

An object possessing an excess of An object possessing an excess of 6.0E+6 electrons has a net charge of 6.0E+6 electrons has a net charge of magnitudemagnitude

A. 5.5E–24 C A. 5.5E–24 C B. 9.6E–13 C B. 9.6E–13 C C. 2.7E–26 C C. 2.7E–26 C D. 3.8E–13 CD. 3.8E–13 C

If an object has a net negative charge of 4.0 If an object has a net negative charge of 4.0 coulombs, the object possessescoulombs, the object possesses

A. 6.3 10+18 more electrons than protonsA. 6.3 10+18 more electrons than protons

B. 6.3 10+18 more protons than electronsB. 6.3 10+18 more protons than electrons

C. 2.5 10+19 more electrons than protonsC. 2.5 10+19 more electrons than protons

D. 2.5 10+19 more protons than electronsD. 2.5 10+19 more protons than electrons

Two electrons are separated by a Two electrons are separated by a distance of 3.00E–6 meter. What are distance of 3.00E–6 meter. What are the magnitude and direction of the the magnitude and direction of the electrostatic forces each exerts on the electrostatic forces each exerts on the other?other?A. 2.56E–17 N away from each otherA. 2.56E–17 N away from each otherB. 7.67E–23 N away from each otherB. 7.67E–23 N away from each otherC. 2.56E–17 N toward each otherC. 2.56E–17 N toward each otherD. 7.67E–23 N toward each otherD. 7.67E–23 N toward each other

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

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 isA.3.20E–34 N/C B. 2.00E–14 N/C C. 1.25E4 N/C D. 2.00E+16 N/C