Energy And Electricity Quiz

13 Questions | Total Attempts: 577

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Energy And Electricity Quiz

This quiz covers basic concepts related to electricity, such as capacitance, ohm's law, inductance, electric force, and electric potential.


Questions and Answers
  • 1. 
    A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves?
    • A. 

      They are unaffected.

    • B. 

      They separate further.

    • C. 

      They move closer together.

    • D. 

      Cannot be determined without further information.

  • 2. 
    A metal sphere of radius 2.0 cm carries a charge of 3.0 μC. What is the electric field 6.0 cm from the center of the sphere?
    • A. 

      3.4 × 10^6 N/C

    • B. 

      9.3 × 10^6 N/C

    • C. 

      7.5 × 10^6 N/C

    • D. 

      4.2 × 10^6 N/C

    • E. 

      5.7 × 10^6 N/C

  • 3. 
    A uniform electric field E = Esubzero j is set-up along the y-axis in a region of space. A frame is placed in that region in such a way that its plane is perpendicular to the y-axis. Which of the following changes would decrease the magnitude of the electric flux through the frame?
    • A. 

      Sliding the frame sideways parallel to the z-axis within the xz-plane.

    • B. 

      Moving the frame vertically along the y-axis keeping parallel to the xz-plane.

    • C. 

      Sliding the frame sideways parallel to the x-axis within the xz-plane.

    • D. 

      Tilting the frame so that its plane is now in the yz-plane.

    • E. 

      Rotating the frame in the xz-plane with respect to the y-axis.

  • 4. 
    Two long straight parallel lines of charge, #1 and #2, carry positive charge per unit lengths of Lambda1 and Lambda2, respectively. Lambda1 > Lambda2. The locus of points where the electric field is zero in this case is:
    • A. 

      Along a line between the lines closer to line #2 than line #1.

    • B. 

      Along a line between the lines closer to line #1 than line #2.

    • C. 

      At a point halfway between the lines.

    • D. 

      Along line #1.

    • E. 

      Cannot be determined.

  • 5. 
    An infinitely long cylinder of radius R = 2 cm carries a uniform charge density Sigma = 18 μC/m3. Calculate the electric field at distance r = 1 cm from the axis of the cylinder.
    • A. 

      0

    • B. 

      2.5 × 103 N/C

    • C. 

      10.2 × 103 N/C

    • D. 

      5.1 × 103 N/C

    • E. 

      2.0 × 103 N/C

  • 6. 
    A negative charge, if free, tries to move:
    • A. 

      Away from infinity.

    • B. 

      From high potential to low potential.

    • C. 

      In the direction of the electric field.

    • D. 

      From low potential to high potential.

    • E. 

      Toward infinity.

  • 7. 
    If the electric field is 12 V/m in the positive x-direction, what is the potential difference between the origin, (0,0), and the point (3.0 m, 4.0 m)?
    • A. 

      48 V with the origin at the lower potential

    • B. 

      36 V with the origin at the higher potential

    • C. 

      48 V with the origin at the higher potential

    • D. 

      36 V with the origin at the lower potential

    • E. 

      Cannot be determined

  • 8. 
    Two charges QA = +q and QB = - 3q are located on the x-axis at x= 0 and x= d respectively. Where is the electric potential equal to zero?
    • A. 

      X = d/4

    • B. 

      X= d/2

    • C. 

      X= d/3

    • D. 

      X= 2d/3

    • E. 

      X= 3d/4

  • 9. 
    The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
    • A. 

      It remains constant.

    • B. 

      It increases.

    • C. 

      It decreases.

    • D. 

      Cannot be determined from the information given.

  • 10. 
    A dielectric is inserted between the plates of an isolated parallel-plate capacitor that carries a charge Q. What happens to the potential energy stored in the capacitor?
    • A. 

      The potential energy of the capacitor decreases.

    • B. 

      The potential energy of the capacitor remains the same.

    • C. 

      The potential energy of the capacitor increases.

    • D. 

      The potential energy of the capacitor increases or decreases depending on the value of the dielectric constant of the capacitor.

    • E. 

      More information is needed to answer the question.

  • 11. 
    A 6.00-μF parallel plate capacitor has a charge of +40.0 μC and -40.0 μC on each plate, respectively. The potential energy stored in this capacitor is:
    • A. 

      123 μJ

    • B. 

      113 μJ

    • C. 

      103 μJ

    • D. 

      143 μJ

    • E. 

      133 μJ

  • 12. 
    Which of the following cylindrical wires has the largest resistance? All wires are made of the same material.
    • A. 

      A wire of length L and diameter d

    • B. 

      A wire of length L and diameter d/2

    • C. 

      A wire of length L/2 and diameter 2d

    • D. 

      A wire of length L/2 and diameter d

    • E. 

      A wire of length L and diameter 2d

  • 13. 
    A 500-W device is connected to a 120-V ac power source. What peak current flows through this device?
    • A. 

      170 A

    • B. 

      5.9 A

    • C. 

      4.2 A

    • D. 

      150 A

    • E. 

      120 A

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