Physics II Electric Fields Quiz
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Questions and Answers

Which faculty focuses on the study of technology?

  • Faculty of Computer Science and Engineering (correct)
  • Faculty of Applied Health Science
  • Faculty of Environmental Studies
  • Faculty of Arts and Humanities
  • Who is the author of the document?

  • Dr. Smith
  • Dr. Brown
  • Professor Johnson
  • Dr. (correct)
  • What is the common theme among the faculties mentioned?

  • Dedication to the arts and culture
  • Focus on health and social sciences
  • Emphasis on engineering and technology (correct)
  • Specialization in natural sciences
  • Which of the following would NOT likely be a part of the Faculty of Applied Health Science?

    <p>Software Engineering</p> Signup and view all the answers

    Which faculty is most likely to cover topics in information technology?

    <p>Faculty of Computer Science and Engineering</p> Signup and view all the answers

    What determines the total electric field at a point due to multiple charges?

    <p>The vector sum of the electric fields from all source charges</p> Signup and view all the answers

    What happens to the small positive test charge $q_0$ when placed near a larger positive charge $Q$?

    <p>It will experience a repulsive force away from charge $Q$.</p> Signup and view all the answers

    Which factor is NOT relevant when calculating the electric field due to a group of charges at a specific point?

    <p>The charge of the point at which the field is being calculated</p> Signup and view all the answers

    Which statement accurately describes the relationship between $q_0$ and $Q$?

    <p>They exert equal and opposite forces on each other.</p> Signup and view all the answers

    When multiple electric fields interact at a point, what must be done to determine the resultant field?

    <p>Add all the electric field vectors algebraically</p> Signup and view all the answers

    How does the magnitude of charge $Q$ affect the behavior of $q_0$ when both are positive?

    <p>The larger the $Q$, the greater the force exerted on $q_0$.</p> Signup and view all the answers

    What is an essential property of electric fields produced by multiple charges?

    <p>They can have both magnitude and direction</p> Signup and view all the answers

    If a negative charge were introduced to the system containing $q_0$ and $Q$, what would happen?

    <p>The negative charge would attract both $q_0$ and $Q$.</p> Signup and view all the answers

    Which of the following statements about electric fields from multiple charges is incorrect?

    <p>The total electric field is simply the sum of all charge magnitudes.</p> Signup and view all the answers

    What determines the direction of the force experienced by the test charge $q_0$?

    <p>The nature of the charges (positive or negative) involved.</p> Signup and view all the answers

    What results from the forces acting on the dipole?

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

    What is the primary effect of the torque on the dipole?

    <p>Rotates the dipole</p> Signup and view all the answers

    What is the role of the forces +F and -F in relation to the dipole?

    <p>They cancel each other out</p> Signup and view all the answers

    What happens to the forces acting on the dipole's charges?

    <p>They induce a torque</p> Signup and view all the answers

    How does the dipole react to the equal and opposite forces?

    <p>It undergoes rotational motion</p> Signup and view all the answers

    What is the expression used to calculate the force (F) in electric fields?

    <p>$F = q_0 E$</p> Signup and view all the answers

    If the force on a charge 𝒒𝟎 is $3.2 × 10^{-15} N$, what could be the value of the electric field (E) if the charge is $1.6 × 10^{-19} C$?

    <p>$2.0 × 10^{4} N/C$</p> Signup and view all the answers

    Given two charges, 𝒒𝟏 = 7μC and 𝒒𝟐 = -5μC, what is the net force acting on 𝒒𝟐 if it is located 0.3m from 𝒒𝟏?

    <p>Attractive force towards 𝒒𝟏</p> Signup and view all the answers

    Which of the following statements about electric fields is accurate?

    <p>Electric field direction is from positive to negative charges.</p> Signup and view all the answers

    What is the unit of charge used in the given example?

    <p>MicroCoulombs (μC)</p> Signup and view all the answers

    Where are the electric field lines closest together?

    <p>In areas of strong electric field strength</p> Signup and view all the answers

    What does it indicate if the density of electric field lines through surface A is greater than through surface B?

    <p>Surface A is in a region of stronger electric field</p> Signup and view all the answers

    How is the strength of the electric field represented by field lines?

    <p>By the frequency and density of the lines</p> Signup and view all the answers

    What does it mean for electric field lines to be far apart?

    <p>The electric field is weak</p> Signup and view all the answers

    In which of the following scenarios would you expect to find electric field lines spaced far apart?

    <p>Farther away from a positive charge</p> Signup and view all the answers

    Study Notes

    Physics II (PHY211)

    • Course offered by the Faculty of Applied Health Science Technology, Faculty of Computer Science and Engineering at New Mansoura University
    • Course taught by Dr. Mohamed EL-Henawey

    Electric Fields

    • An electric field exists in the region surrounding a charged object, the source charge
    • The presence of an electric field can be detected by placing a test charge in the field and measuring the electric force on it.
    • Example: A small positive test charge near a larger positive charge.

    Electric Field Vector

    • Defined as the electric force on a positive test charge divided by the test charge
    • Formula: E = Fe / qo (where E is the electric field vector, Fe is the electric force, and qo is the test charge)
    • Units: Newtons per Coulomb (N/C)
    • Direction: The direction of the electric field is the same as the direction of the force on a positive test charge.

    The Electric Field of a Point Charge

    • According to Coulomb's law: Fe = k * (q * qo) / r^2 (where k is Coulomb's constant, q is the source charge, qo is the test charge, and r is the distance between the charges)
    • Electric field vector formula: E = k * q / r^2 (where k is Coulomb's constant, q is the source charge, and r is the distance between the charges)

    Electric Field Direction

    • For a positive source charge, the field is directed away from the charge
    • For a negative source charge, the field is directed towards the charge

    Electric Fields from Multiple Charges

    • The total electric field at a point due to multiple charges is the vector sum of the electric fields due to each individual charge
    • Formula: E = Σ (k * qi / ri^2) * ri

    Example (1): Proton in an electric field

    • Given an electric field of (2 × 10^4 N/C), the force experienced by a proton is calculated using F = qoE

    Example (2): Electric field at a point P.

    • Find the electric field at point P with coordinates (0, 0.4) m due to two charges of opposite sign along the x-axis.

    Electric Field - Continuous Charge Distribution

    • Procedure for calculating the total electric field due to a continuous charge:
      1. Divide the charge distribution into small elements (Aq).
      2. Calculate the electric field due to one element at the point P.
      3. Sum the contributions of all charge elements.
    • Formula For the individual charge element: ∆E=k∆q/r^2

    Different cases of charge distribution

    • Uniform volume charge density: ρ = Q/V (where Q is the total charge and V is the volume)
    • Surface charge density: σ = Q/A (where Q is the total charge and A is the surface area)
    • Linear charge density: λ = Q/L

    Electric Field Lines

    • The number of lines per unit area through a surface perpendicular to the lines is proportional to the magnitude of the electric field in that region.
    • Field lines are closer together in stronger fields.
    • The intensity of the electric field is higher where field lines are closer to each other.
    • A positive charge generates field lines radiating outwards and negative charges radiate inward

    Motion of Charged Particles in an Electric Field

    • A positive charge accelerates in the direction of the electric field
    • A negative charge accelerates in the opposite direction of the electric field

    Motion of an Electric Dipole in a Uniform Electric Field

    • The net force on a dipole in a uniform electric field is zero.
    • A torque acts on the dipole, tending to align it with the field.
    • Torque formula: τ = pEsinθ (where p is the dipole moment, E is the electric field, and θ is the angle between p and E).

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    Lecture 2 PDF - Electric Fields

    Description

    Test your knowledge on electric fields and their properties in Physics II (PHY211). This quiz covers concepts such as the electric field vector, Coulomb's law, and how electric fields interact with charge. Perfect for students seeking to understand the foundational aspects of electric fields.

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