exam 2 old

1. 1If a capacitor has a capacitance of 10.2 µF and we wish to lower the potential
   difference across the plates by 60.0 V, how much charge will we have to remove?

   1. A10.2 µC
   2. B612 C
   3. C10.2 C
   4. D0.17 µC
   5. E612 µC
2. 2Consider the assembly of capacitors shown here. Let C 1 = C 2 = C 3 = C 4 = 10 mF. What
   is the equivalent capacitance of this circuit?

   1. A40 mF
   2. B7.5 mF
   3. C15 mF
   4. D20 mF
   5. E30 mF
3. 3Suppose that three points are set at equal (large) distances r from the center of an
   electric dipole. Point 2 is on the dipole axis above the positive charge, point 1 is on the
   axis below the negative charge, and point 3 is on a perpendicular bisector through the line
   connecting the two charges. Rank the points according to the electric potential of the
   dipole shown, greatest (most positive) first.

   

   1. A1, 2, 3.
   2. B3, 1, 2
   3. C2, 1, 3
   4. D2, 3, 1
   5. EAll have the same value
4. 4What is the magnitude of the electric field at the point (3.0i − 2j + 4k) m if the electric
   potential is given by V = 2.00 xyz^2 , where V is in volts and x, y, and z are in meters?

   

   1. A125.3 V/m
   2. B150.1 V/m
   3. C175.5 V/m
   4. D98 V/m
   5. E225.5 V/m
5. 5In the figure below, two parallel-plate capacitors A and B are connected in parallel
   across a 600 V battery. Each plate has area 80.0 cm 2 ; the plate separations are 3.00 mm.
   Capacitor A is filled with air; capacitor B is filled with a dielectric of dielectric constant κ
   = 2.60.
   
   What is the free charge density σ (in C/m 2 ) on the higher-potential plate of capacitor B?

   

   1. A7.50e-6
   2. B5.75e-8
   3. C2.50e-6
   4. D4.60e-6
6. 6How much work (in Joules) is required to set up an arrangement of two negative
   charges and two positive charges, with each of the charges located individually at one of
   the corners of a square of side a? The two positive charges are located diagonally across
   from each other, as are the two negative charges. The magnitude of each of the charges
   is q = 2.30 pC, while the length of each side is a = 64.0 cm. The particles are initially
   infinitely far apart and at rest?

   

   1. A- 1.92e-13
   2. B+1.92e-13
   3. C+ 6.21e-13
   4. D– 6.21e-13
   5. E– 3.77e-13
7. 7In an ionic solution, sodium ions (positively charged) are moving to the right and
   chlorine ions (negatively charged) are moving to the left. In which directions are the
   currents due to the motions of the sodium ions and chlorine ions?

   1. ABoth are to the right.
   2. BCurrent due to sodium ions is to the left; current due to chlorine ions is to the
      right.
   3. CCurrent due to sodium ions is to the right; current due to chlorine ions is to the
      left.
   4. DBoth are to the left.
   5. ENone of the above.
8. 8A portion of a circuit is shown, with the values of the currents given for some
   branches. What is the direction and value of the current i?

   

   1. Adown, 6A
   2. Bup, 6A
   3. Cdown, 4A
   4. Dup, 4A
   5. Edown, 2A
9. 9A parallel-plate capacitor C has a charge Q. The actual charges on its plates are:

   1. AQ, Q
   2. BQ/2, Q/2
   3. CQ, –Q
   4. DQ/2, –Q/2
   5. EQ, 0
10. 10During the 4.0 min that a 5.0A current flows in a wire, how many electrons pass
    through any cross section along the wire?

    1. A7.5e21
    2. B4.2e19
    3. C5.7e19
    4. D3.1e18
    5. E9.7e20

11. 11A certain wire has a resistance R. What is the resistance of a second wire, made of
    the same material, that is half as long and has half the diameter?

    1. AR
    2. BR/2
    3. C2R
    4. D4R
    5. ER/4
12. 12For the junction shown in the figure, which equation correctly expresses the sum of
    the currents?

    

    1. Ai 1 + i 2 + i 3 + i 4 = 0
    2. Bi 1 - i 2 + i 3 + i 4 = 0
    3. C- i 1 + i 2 + i 3 - i 4 = 0
    4. Di 1 - i 2 - i 3 - i 4 = 0
    5. Ei 1 + i 2 - i 3 - i 4 = 0
13. 13If the current through a resistor is increased by a factor of 4, how does this affect the
    power dissipated?

    1. AIt decreases by a factor of 4.
    2. BIt increases by a factor of 2.
    3. CIt ncreases by a factor of 8.
    4. DIt increases by a factor of 4.
    5. EIt increases by a factor of 16.
14. 14Two charged particles, Q 1 = + 12.0 mC and Q 2 = -5.0mC, are placed at different
    points 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. DI and IV
    5. EII and IV
15. 15A line of charge of magnitude 2.60 C is uniformly distributed on a 90.0 degree arc
    with radius R = 3.00 m. What is the magnitude of the electric potential at point P (in V)
    (select the closest answer)?

    

    1. A7791
    2. B8804
    3. C9949
    4. D11242
    5. E12704

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Test sobre exam 2 old, creado por hank fournier el 26/06/2018.

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hank fournier

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