exam 1 new

1. 1Two charged particles attract each other with a force F. If the charges are both doubled,
   and the distance between the charges is halved then the force

   1. Ais 1/2 as strong
   2. Bis 4 times stronger
   3. Cis twice as strong
   4. Dremains the same
   5. Eis 16 times stronger
2. 2A neutral copper sphere is brought close to a charged insulating sphere. The electrostatic
   force between the conducting sphere and insulating sphere is:
   

   1. Azero
   2. Battractive
   3. Crepulsive
   4. Dattractive or repulsive depending on the sign of the charged sphere
3. 3Initially, sphere A has a charge of −60e and sphere B has a charge of +20e. The spheres
   are made of conducting material and are identical in size. If the spheres then touch,
   what is the resulting charge on sphere B?

   1. A+10e
   2. B+20e
   3. C-10e
   4. D-40e
   5. E-20e
4. 4A +5.0 C charge is located at the origin. A −13.0 C charge is placed at x = 1.0 m. At
   what finite location(s) on the x axis will the electric field be equal to zero?
   

   1. Anot in between, but closer to the positive particle
   2. Bin between the particles, closer to the negative particle
   3. Cnot in between, but closer to the negative particle
   4. Din between the particles, closer to the positive particle
   5. Eit can never be zero
5. 5Consider a cubical box that contains a charge distribution of total charge q = 6.40 µC.
   The total electric flux through 5 of the 6 sides is Φ = 3.90 × 105 Nm2/C. What is the
   electric flux through the remaing sixth surface of the box (in Nm2/C)?

   

   1. A5.34 e5
   2. B6.24 e5
   3. C4.56 e5
   4. D3.33 e5
   5. E3.90 e5
6. 6A line of charge of magnitude 2.60 µC is uniformly distributed on a 90.0◦ arc with radius
   R = 3.00 m. What is the magnitude of the electric field at point P (in N/C)?
   

   

   1. A1.12 e3
   2. B8.80 e3
   3. C2.30 e3
   4. D9.90 e4
   5. E1.27 e4
7. 7A total of 1.45 × 106
   electrons are deposited on an initially electrically neutral wire of
   length 2.26 m. What is the magnitude of the electric field at a point that is a perpendicular
   distance of 0.401 m away from the center of the wire? (Hint: Assume that 2.26 m
   is close enough to “infinitely” long.)
   

   1. A6.77 × 10^1 N/C
   2. B2.92 × 10^−1 N/C
   3. C4.61 × 10^−3 N/C
   4. D8.12 × 10^2 N/C
   5. E3.31 × 10^3 N/C
8. 8An electric dipole is placed into a uniform electric field directed to the right as shown in
   the figure. What motion will the dipole have in this electric field?

   

   1. AIt will move to the right.
   2. BIt will move to the left.
   3. CIt will rotate counter-clockwise.
   4. DIt will rotate clockwise.
   5. EIt will move to the right and rotate clockwise.
9. 9A spherical conducting shell has an outer radius of 0.10 m and an inner radius of 0.040 m.
   Within the shell is a charge q = −2.0 × 10−9 C. What is the surface charge density on
   the outer surface of the shell?

   1. A−2.0× 10^−9 C/m^2
   2. B−9.9 × 10^−9 C/m^2
   3. C−3.8 × 10^−10 C/m^2
   4. D−1.6 × 10^−8 C/m^2
   5. E−8.0 × 10^−8 C/m^2
10. 10A single positive test charge q is brought near a dipole. Under what circumstances will
    the force exerted on the test charge by the dipole be given by

    

    1. Athe test charge is a much greater charge than that of the dipole
    2. Bthe test charge is a much smaller charge than that of the dipole
    3. Cthe test charge is at a distance that is very far from the dipole compared to
       the distance between the dipole charges
    4. Dthe test charge is on a line that is perpendicular to the dipole axis

11. 11What is the magnitude of the electric field at the point (3.0i − 2j + 4k) m if the electric
    potential is given by V = 2.00x^2yz, where V is in volts and x, y, and z are in meters?

    1. A98 V/m
    2. B150 V/m
    3. C175.5 V/m
    4. D125.3 V/m
    5. E225.5 V/m
12. 12Two charged particles, Q1 = +12.0 mC and Q2 = −5.0 mC, are placed on a line. At
    what finite locations along the line may the electric potential be equal to zero?
    
    I in between the particles, closer to the positive particle
    II in between the particles, closer to the negative particle
    III not in between, but closer to the positive particle
    IV not in between, but closer to the negative particle
    V it can never be zero

    1. AI only
    2. BII only
    3. CV only
    4. DII and IV
    5. EI and IV
13. 13Three particles are fixed on an x axis. Particle 1 of charge q1 is at x = −a, and particle
    2of charge q2 is at x = +a. If their net electrostatic force on particle 3 of charge +Q is
    to be zero, what must be the ratio q1/q2 when particle 3 is at x = +a/2?

    1. A-25
    2. B9
    3. C1
    4. D5
    5. E16
14. 14Two parallel infinite nonconducting sheets of charge carry equal charge distributions σ
    of opposite sign. Which of the following expressions gives the electric field in the region
    between the sheets?

    1. AE = σ ε0
    2. BE =σ/ε0
    3. CE =σ/2(ε0)
    4. DE =σ/4(ε0)
15. 15An electron traveling horizontally to the right enters a region where a uniform electric
    field is directed downward. What is the force exerted on the electron once it has entered
    the field.

    1. Aupward
    2. Bdownward
    3. Ctp the right
    4. Dto the left
    5. Ethe force is zero newtons

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Quiz on exam 1 new, created by hank fournier on 31/07/2018.

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hank fournier

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