Electric Fields and Flux Quiz
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Questions and Answers

What do electric field lines represent?

  • The direction of the net electric field (correct)
  • The strength of charges
  • The total electric potential
  • The distance between charges

    • Where do electric field lines start and end?

  • From neutral points to charged points
  • Always from negative charges to positive charges
  • From positive charges to negative charges or infinity (correct)
  • Within conductors only

    • What happens to electric field lines in a charge-free region?

  • They remain continuous without breaks (correct)
  • They form closed loops
  • They become discontinuous
  • They disappear

    • How is electric flux mathematically defined?

    <p>Electric Flux = $\vec{E} \cdot \vec{A}$</p> Signup and view all the answers

    When is electric flux maximum through a surface?

    <p>When the area vector is parallel to the electric field</p> Signup and view all the answers

    What happens when an object loses electrons?

    <p>It becomes positively charged.</p> Signup and view all the answers

    Which type of charge will repel another object with the same type of charge?

    <p>Negative charge</p> Signup and view all the answers

    What is the effect of rubbing a glass rod with silk?

    <p>The glass rod becomes positively charged.</p> Signup and view all the answers

    What device is used to determine if an object is charged?

    <p>Gold-leaf electroscope</p> Signup and view all the answers

    What occurs during a static electricity discharge when touching a metal object?

    <p>A transfer of charge occurs, resulting in an electric shock.</p> Signup and view all the answers

    What is the first step in charging two metal spheres using induction?

    <p>Bring a positively charged glass rod near sphere A</p> Signup and view all the answers

    What happens to sphere A and B when the charged glass rod is removed?

    <p>They return to their original neutral state</p> Signup and view all the answers

    In Coulomb's Law, what does the variable F represent?

    <p>The force between the charges</p> Signup and view all the answers

    Which of the following statements about conductors and insulators is correct?

    <p>Conductors allow electricity to pass easily</p> Signup and view all the answers

    What occurs after one sphere is positively charged and the other negatively charged during induction?

    <p>The charges redistribute back into neutrality after some time</p> Signup and view all the answers

    What defines the linear charge density (λ)?

    <p>Charge per unit length</p> Signup and view all the answers

    Which property is associated with surface charge distribution?

    <p>Charge per unit area</p> Signup and view all the answers

    What is the purpose of examining the electric field due to a finite wire?

    <p>To analyze electric fields from a defined length of charge</p> Signup and view all the answers

    In the context of electric fields, what is the significance of distance to the point where the field is calculated?

    <p>It influences the strength of the electric field</p> Signup and view all the answers

    Which type of charge distribution involves the charge uniformly distributed throughout a volume?

    <p>Volume charge distribution</p> Signup and view all the answers

    What determines the density of electric field lines?

    <p>The strength of the electric field</p> Signup and view all the answers

    What happens to the electric flux through a closed surface if there are no charges enclosed?

    <p>It is zero</p> Signup and view all the answers

    How is electric flux mathematically defined?

    <p>Φ = ∫ E ⋅ dA</p> Signup and view all the answers

    Electric field lines can intersect each other under which condition?

    <p>Under no condition</p> Signup and view all the answers

    What is the unit of measurement for electric flux?

    <p>V⋅m</p> Signup and view all the answers

    What is the relationship stated by Gauss's law?

    <p>The total flux through a closed surface is directly proportional to the total charge enclosed.</p> Signup and view all the answers

    Which statement about the Gaussian surface is true?

    <p>The Gaussian surface can be of any shape.</p> Signup and view all the answers

    For a uniformly charged spherical shell, what is true regarding the electric field?

    <p>The electric field is zero inside the shell and radial outside.</p> Signup and view all the answers

    How is the total electric flux through a Gaussian surface calculated?

    <p>By integrating the area element and considering the angle with the electric field.</p> Signup and view all the answers

    What can be inferred about the charge density in the case of an infinitely large charged conducting sheet?

    <p>The charge density is uniform and denoted as 'σ'.</p> Signup and view all the answers

    What happens to an electric dipole placed in a uniform electric field?

    <p>It experiences equal and opposite forces, resulting in a net zero force.</p> Signup and view all the answers

    What is the expression for torque experienced by an electric dipole?

    <p>$t = qE(2a sin θ)$</p> Signup and view all the answers

    In the end-on position, what is the formula for the electric field at a large distance from a dipole?

    <p>$E = (2kp cos θ/4πε₀r³)$</p> Signup and view all the answers

    How is the resultant electric field at a general point derived from an electric dipole?

    <p>By resolving the dipole moment into its components.</p> Signup and view all the answers

    What determines the electric field at a point on the equatorial line of a dipole?

    <p>$E = (kp sin θ/4πε₀r³)$</p> Signup and view all the answers

    For a dipole in a uniform electric field, which factor causes the torque on the dipole?

    <p>The separation distance and angle between the dipole moment and field direction.</p> Signup and view all the answers

    Which quantities relate to the electric field strength derived from continuous charge distributions?

    <p>Charge distribution type and density.</p> Signup and view all the answers

    What type of molecules often exhibit electric dipole moments?

    <p>Polar molecules such as H₂O and NH₃.</p> Signup and view all the answers

    What does the electric field due to an infinitely long line charge depend on?

    <p>The linear charge density and perpendicular distance from the line charge</p> Signup and view all the answers

    Which formula correctly describes the electric field due to an infinitely large charged conducting sheet?

    <p>$E = \frac{\sigma}{2\epsilon_0}$</p> Signup and view all the answers

    For an infinitely large non-conducting thin sheet, what is the dependency of the electric field?

    <p>Independent of distance from the sheet</p> Signup and view all the answers

    What is the electric field inside a uniformly charged spherical shell for $r < R$?

    <p>$E = 0$</p> Signup and view all the answers

    How does the electric field behave outside a uniformly charged solid conducting sphere for $r \ge R$?

    <p>Behaves like a point charge</p> Signup and view all the answers

    What does the variable ( \sigma ) represent in the formulas related to electric fields?

    <p>Surface charge density</p> Signup and view all the answers

    What variable represents the distance from the center of a charged sphere in the electric field formulas?

    <p>r</p> Signup and view all the answers

    Which of the following equations describes the electric field at a distance r from the center of a uniformly charged solid conducting sphere? Assume $r \ge R$.

    <p>$E = \frac{KQ}{r^2}$</p> Signup and view all the answers

    What does Coulomb's Law state about the force between two point charges?

    <p>The force decreases with the square of the distance between the charges.</p> Signup and view all the answers

    How does the presence of a dielectric medium affect the electric force between charges?

    <p>It decreases the electric force by a factor equal to the dielectric constant.</p> Signup and view all the answers

    What is the principle of superposition in the context of forces between charges?

    <p>The net force on a charge is the sum of the forces due to all other charges.</p> Signup and view all the answers

    What does the constant $k$ in Coulomb's Law represent?

    <p>The proportionality constant for the force between two charges.</p> Signup and view all the answers

    In what configuration do arrows in charge interaction diagrams indicate the nature of forces?

    <p>They show the magnitude and direction of the forces.</p> Signup and view all the answers

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