Clemson Physics 2210 Exam 2

1. 1The direction of the electric field produced by a positive charge a small distance away from the charge is

   1. Aaway from the charge
   2. Btoward the charge
   3. Cdepends on the sign of the test charge
   4. Dboth a and c
   5. Eboth b and c
2. 2If the charge on a parallel plate capacitor is Q, what happens to the voltage between the plates if the spacing "d" is increased?

   1. AChange in Vc stays the same
   2. BChange in Vc increases
   3. CChange in Vc decreases
   4. DQ increases
   5. EQ decreases
3. 3The magnitude of the electric field outside of a uniformly charged conducting sphere, insulating sphere and spherical shell is Ec, Ea, Es, respectively. What is a true statement about these magnitudes at a point P outside each sphere. Each sphere has the same radius and charge.

   1. AEc = Ea = Es
   2. BEc > Ea > Es
   3. CEa > Ec > Es
   4. DEs > Ec > Ea
   5. EEs > Ea > Ec
4. 4What is the work done on a proton to move it from a neutral conductor to a conducting plate at an electric potential of 100.0V?

   1. A1.0eV
   2. B10.0eV
   3. C100eV
   4. D1000eV
5. 5A conductor is placed in an electric field under electrostatic conditions. Which of the following statements is correct for this situation?

   1. AThe electric field is zero inside the conductor
   2. BAll freely moving electrons go to the surface of the conductor
   3. CThe electric field on the surface of the conductor is perpendicular to the surface
   4. DThe electric potential is the same everywhere in the conductor
   5. EAll of the above
6. 6A solid spherical conductor of surface charge density na lies inside a spherical conducting shell of surface charge density nb. The sphere and the shell have a radius a and b, respectively.
   
   What is the magnitude of the electric field E for r < a, inside the solid conductor?

   1. AElectric Field = 0
   2. BElectric Field > 0
7. 7What is the electric field a distance r away from a uniformly charged infinite plane of surface charge density n? The plane is charged on both sides.

   1. An/(εo)
   2. Bn/(2εo)
   3. C(kAn)/r²
   4. D(kAn)/r
   5. E(nA)/(4*pi*εo*r²)
8. 8What is the net electric flux through a box if it contains a conducting sphere of radius R and surface charge density n? The box is not charged.

   1. A0
   2. B(4/3)πR³n/εo
   3. C4πR²n/εo
   4. Dn/εo
   5. En/2εo
9. 9What is true about a charged conductor in static equilibrium?

   1. AE = 0 inside; E perpendicular to the surface
   2. BE ≠ 0 inside; E parallel to the surface
   3. CE = 0 inside; E=0 on the surface
10. 10Three charges -2q, q and 4q are placed in a cubic box. What is the electric flux through one of the sides?

    1. A0
    2. B3q/εo
    3. Cq/2εo
    4. Dq/εo
    5. Eq/3εo

11. 11Suppose we place an electric dipole of charge q in a box. What is the net electric flux through the box?

    1. Aq/εo
    2. B2q/εo
    3. C0
    4. D-q/εo
    5. E-2q/εo
12. 12Suppose an electron has an initial velocity pointing to the right. It moves from point A to point B in a potential differences that is positive. What will happen to the electron immediately after it starts moving at point A?

    1. Athe electron comes to the complete stop
    2. Bthe electron speeds up
    3. Cthe electron slows down
    4. Dthe electron remains at constant velocity
13. 13Suppose we place a certain amount of charge on a parallel place capacitor. If we then increase the plate spacing d, what will happen?

    1. Aa) the electric field strength inside the capacitor increases
    2. Bb) the voltage of the capacitor increases
    3. Cc) the electric field strength inside the capacitor decreases
    4. Dboth a and b
    5. Eboth c and b
14. 14If a metal sphere is charged by induction with a positive rod, what is the resulting charge of the metal sphere?

    1. Aneutral
    2. Bpositive
    3. Cnegative
15. 15A conducting cube is placed inside an imaginary sphere. The cube has side length d and surface density n. What is the electric flux through the imaginary sphere?

    1. An/εo
    2. Bnd²/εo
    3. C6nd²/εo
    4. D4πnd²/εo
16. 16What is a false statement about electric potential?

    1. AElectric field points in a direction toward lower potential
    2. BElectric field points in a direction toward higher potential
    3. CThe potential difference between two points on an equipotential surface is zero
    4. DThe electric potential for a point charge is kq/r
    5. EThe voltage of a parallel plate capacitor is Ed
17. 17Which statement is correct if r is the distance away from the following charge distributions?

    1. AThe electric field strength away from a point charge depends on on 1/r
    2. BThe electric field strength away from a uniform spherical charge distribution depends on 1/r/
    3. CThe electric potential away from a uniform spherical charge distribution depends on 1/r².
    4. DThe electric potential away from a uniform spherical charge distribution depends on 1/r.
    5. EThe electric potential away from a point charge depends on 1/r².
18. 18What is a false statement about the Coulomb force?
    

    1. AThe Coulomb force is conservative.
    2. BThe Coulomb force obeys Newton's Laws
    3. CThe force on a negative point charge in the presence of an electric field is in the same direction as the electric field
    4. DThe coulomb force varies as the inverse square of the distance
    5. EThe force on a positive point charge in the presence of an electric field is in the same direction as the electric field
19. 19What is the direction of an electric field?

    1. A+Q to -Q
    2. B-Q to +Q
20. 20A negative charge lies between points A and B as illustrated below. If dV = Vb - Va > 0, what is a true statement? Neglect the contribution of the charge to the electric field.

    1. AThe electric field between A and B points toward B and toward lower potential energy
    2. BThe electric field between A and B points toward A and toward higher potential energy
    3. CThe electric field between A and B points toward B and toward higher potential energy
    4. DThe electric field between A and B points toward A and toward lower potential energy
21. 21A piece of metal was charged positively by the method of induction. What was the charge of the object used to charge this piece of metal?

    1. Anegative
    2. Bpositive
    3. Cneutral
22. 22An electron is placed between points A and B. If dV = Vb - Va > 0, what are the directions of E, Fc on the election and the direction of lower potential energy, respectively?

    1. Aright, right, right
    2. Bleft, left, left
    3. Cleft, right, right
    4. Dleft, right, left
    5. Eleft, left, right
23. 23Rank the following closed surfaces in order from largest to smallest electric flux. All charges have the same magnitude.

    

    1. AS1, S2, S3
    2. BS3, S2, S1
    3. CS2, S3, S1
    4. DS2, S1, S3
    5. ES1, S3, S2
24. 24A spherical conductor with a hollow, concentric spherical center is originally charged (in static equilibrium) to -3C. If a -2C point charge is placed in the center, what are the charges of the interior and exterior conductor surfaces, respectively?

    

    1. A-3C, -2C
    2. B-2C, -3C
    3. C-4C, -1C
    4. D2C, -5C
    5. E2C, 1C
25. 25If a conductor is charged with a positive rod by the method conduction, what is the resulting charge of the conductor?

    1. Apositive
    2. Bnegative
    3. Cneutral
26. 26Suppose a uniform electric field points toward point A. What is the sign of the potential difference dV = Vb - Va > 0?

    1. Apositive
    2. Bnegative
    3. Cneutral
27. 27Suppose a conductor is charged to 5C. If the surface area of the conductor is 2m squared, what is the electric field strength at the surface of the conductor?

    1. A1/5ε C/m2
    2. B5/4ε C/m2
    3. C5/3ε C/m2
    4. D2/5ε C/m2
    5. E5/2ε C/m2
28. 28What is the correct electric field at point P for the charge distribution below? All charges q are positive.

    

    1. A
    2. B
    3. C
    4. D
29. 29A hollow cylindrical conductor is charged to 10nC. What is the charge on the inner surface and the outer surface, respectively? Assume the conductor is in static equilibrium.

    1. A10nC, 10nC
    2. B10nC, 0nC
    3. C5nC, 5nC
    4. D0nC, 0nC
    5. E0nC, 10nC
30. 30A horizontal, uniformly charged infinite plane has two points A and B illustrated below. Which is a false statement?

    

    1. AThe magnitudes of the electric field at points A and B are the same
    2. BThe values of V at points A and B are the same
    3. CThe plane has an infinite amount of charge
    4. DThe values of V at points A and B are different
    5. EThe directions of the electric field at points A and B are the same
31. 31Suppose a uniform electric field exists between points A and B as illustrated below. Assume the electric field either points toward B or toward A. If an electron is placed between points A and B and initially moves from rest to the right, what is a true statement? Let dV = Vb - Va

    

    1. AdV>0, E points toward A
    2. BdV<0, E points toward B
    3. CdV>0, E points toward B
    4. DdV<0, E points toward A
    5. EdV = 0, E = A
32. 32A fixed amount of charge Q is placed on a parallel plate capacitor illustrated below. If d, the capacitor spacing is decreased, what happens to E, the electric field strength inside the capacitor?

    

    1. Ait increases
    2. Bit decreases
    3. Cit stays the same
33. 33Look at the image for the question.

    

    1. Aa
    2. Bb
    3. Cc
    4. Dd
    5. Ee
34. 34An electron starting from rest is placed between points A and B as illustrated below. If the electron moves to the left in a uniform electric field, what are the directions of a) higher electric potential, b) higher potential energy, and c) the electric field.

    

    1. Aleft, right, right
    2. Bleft, right, left
    3. Cright, right, right
    4. Dright, left, left
35. 35What is a false statement about a conductor in static equilibrium?

    1. AThe electric potential is zero everywhere inside and out of the conductor
    2. BThe electric field runs perpendicular to the surface
    3. CThe electric field is zero inside the conductor
    4. DThe conductor is an equi-potential volume
36. 36Which of the following field lines coming from the box-shaped, negatively charged conductor illustrated below is appropriate?

    

    1. AA
    2. BB
    3. CC
    4. DD
    5. EE
37. 37What is a false statement?

    1. ABits of neutral paper are attracted by a charged rod
    2. BCharging by induction involves direct contact with a conductor and a charged insulator
    3. CCharging by conduction involves direct contact with a conductor and a charged insulator
    4. DThe electric field inside a conductor in static equilibrium is zero
    5. EA conductor in static equilibrium is an equipotential volume
38. 38What is the electric potential 5m from the center of a conducting sphere of radius R = 1m if it has a potential of Vo = 100V at its surface?

    1. A20V
    2. B10V
    3. C25V
    4. D30V
    5. E15V
39. 39What is a true statement?

    1. AThe electric field far away from an uniformly charged infinite plane is smaller in strength than close to it
    2. BThe electric field due to a non-uniformly charged sphere is that of a point charge
    3. CIf the potential on the surface of a conductor in static equilibrium is 5V, then potential energy of its interior is also 5V
    4. DField lines can cross
    5. EThe electric field of a conductor is always constant
40. 40What is the correct electric field inside the capacitor illustrated in unit vector notation?

    

    1. AA
    2. BB
    3. CC
    4. DD
    5. EE
41. 41Suppose a charged rod weakly repels another object. What is always false?

    1. AThe object is a neutral insulator
    2. BThe object is a neutral conductor
    3. CThe object is weakly charged
    4. DThe object is positively charged
    5. EThe object is negatively charged
42. 42A charged conductor in static equilibrium has an enclosed cavity (hole). What is a true statement?

    1. AThe net charge lies only on the inner surface of the conductor
    2. BThe E on the outer surface is zero
    3. CThe net charge lies only on the outer surface of the conductor
    4. DThe E inside the conductor is non 0
    5. EThe net charge lies both on the inner and outer surfaces of the conductor
43. 43What is the direction of the Coulomb force on a negative charge due to the electric dipole illustrated?

    

    1. Adown
    2. Binto screen
    3. Cright
    4. Dup
    5. Eleft
44. 44An electron in a uniform electric field between points A and B is initially moving toward B but then slows down. What is a true statement?

    1. AVb > Va; E points to the left
    2. BVb > Va; E points to the right
    3. CVb < Va; E points to the right
45. 45What is false about an electric ground?

    1. AIt can act as a source of electrons
    2. BSome examples of electrical grounds are the earth and an automobile frame
    3. CIt is a big conductor
    4. DIt can neutralize conductors
    5. EIt is a big insulator
46. 46What is a false statement?

    1. AThe potential of a charged conductor in static equilibrium is constant everywhere.
    2. BThe electric field inside a charged conductor is 0
    3. CThe electric field points toward lower potential
    4. DThe electric potential at the center of a charged conductor is always 0
    5. EA uniformly charged spherical distribution acts like a point charge

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Test sobre Clemson Physics 2210 Exam 2, creado por Abraham Close el 06/03/2017.

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