Estimating Density of Electric Field Lines Quiz

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What information do field lines provide about the electric field?

  • Magnitude of the electric field
  • Number of field lines per unit length
  • Direction of the electric field at different points in space (correct)
  • Density of the field lines

How does the number of field lines passing through an enclosing area change with distance from a point charge?

  • Decreases linearly with distance
  • Varies inversely with the square of the distance
  • Remains constant regardless of distance (correct)
  • Increases linearly with distance

In what manner do field lines crowd where the electric field is strong?

  • They become thicker (correct)
  • They do not crowd at all
  • They become more spaced out
  • They become thinner

What is the relationship between the number of field lines crossing an area element and the magnitude of the electric field at that point?

<p>Directly proportional (C)</p> Signup and view all the answers

What happens to field lines when the electric field strength is weak?

<p>They become sparser (C)</p> Signup and view all the answers

What does the relative density (closeness) of field lines indicate?

<p>Relative strength of the electric field at different points (C)</p> Signup and view all the answers

What is the expression for the solid angle DW subtended by a small perpendicular plane area DS at a distance r in three dimensions?

<p>DW = DS/r^2 (A)</p> Signup and view all the answers

In a given solid angle, what remains the same regarding the number of field lines?

<p>The number of radial field lines (D)</p> Signup and view all the answers

What did Faraday call the visual representation of electric fields around charged configurations?

<p>Lines of force (C)</p> Signup and view all the answers

What was Faraday's purpose in inventing the picture of field lines?

<p>To provide an intuitive way of visualizing electric fields (C)</p> Signup and view all the answers

What is the dependence of the strength of the electric field on the distance from the charge?

<p>$1/r^2$ dependence (C)</p> Signup and view all the answers

How is the angle subtended by a small transverse line element Dl approximated at a distance r from a point O?

<p>$Dq = Dl/r$ (C)</p> Signup and view all the answers

What is physically significant when considering electric flux?

<p>The relative number of field lines crossing a given area (A)</p> Signup and view all the answers

What is the unit of electric flux?

<p>N/C (B)</p> Signup and view all the answers

How can the total electric flux through a surface be calculated?

<p>By integrating the dot product of the electric field and area element over the surface (C)</p> Signup and view all the answers

What condition needs to be satisfied for the approximation in calculating electric flux to be exact?

<p>Electric field must be constant and small area element tends to zero (D)</p> Signup and view all the answers

In what direction is the line connecting the two charges of an electric dipole defined?

<p>From positive charge to negative charge (B)</p> Signup and view all the answers

What is true about the total charge of an electric dipole?

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

Flashcards are hidden until you start studying

More Like This

Use Quizgecko on...
Browser
Browser