Electrostatics
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Questions and Answers

What is the effective air separation between the charges when a dielectric medium of thickness t is partially filled between them?

  • r - t + t/K
  • r - t + tK (correct)
  • r - t/K
  • r - t

    • What is the relative strength of the electromagnetic force compared to the gravitational force?

  • 10^24
  • 10^37 (correct)
  • 10^(-37)
  • 10^(-24)

    • What is the property of the electromagnetic force that distinguishes it from the gravitational force?

  • It is always repulsive
  • It is only between masses
  • It can be both attractive and repulsive (correct)
  • It is always attractive

    • What is the unit vector in the vector form of Coulomb's Law?

    <p>r̂12</p> Signup and view all the answers

    What is the condition for Coulomb's law to be valid?

    <p>At a distance greater than 10^-15 m</p> Signup and view all the answers

    What happens to the force of Q1 exerted on Q2 when a third charge Q3 is brought near?

    <p>It remains unchanged</p> Signup and view all the answers

    What is the principle of superposition in electrostatics?

    <p>Total force is the vector sum of individual forces</p> Signup and view all the answers

    What is the ratio of the gravitational force and electrostatic force between two electrons?

    <p>10^43/1</p> Signup and view all the answers

    What is the final force between two point charges if a charge of -5 μC is added to each of them, initially repelling each other with a force of 40 N?

    <p>-10 N</p> Signup and view all the answers

    Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the angle between the strings?

    <p>180°</p> Signup and view all the answers

    What is the ratio of forces acting on two point charges of 1 μC and 5 μC, separated by a certain distance?

    <p>1:1</p> Signup and view all the answers

    Two charges of 40 μC and -20 μC are placed at a certain distance apart. What happens to the force between them when they are touched and kept at the same distance?

    <p>The force becomes zero</p> Signup and view all the answers

    What is the expression for the force between two point charges according to Coulomb's Law?

    <p>F = k × (Q1 × Q2) / r^2</p> Signup and view all the answers

    If the dielectric medium is partially filled between two charges, what is the effective air separation between the charges?

    <p>r - t + tK</p> Signup and view all the answers

    What is the relative strength of the electromagnetic force compared to the gravitational force?

    <p>10^37</p> Signup and view all the answers

    What is the direction of the force vector in Coulomb's Law?

    <p>Along the line joining the two charges</p> Signup and view all the answers

    What is the unit of the permittivity of free space?

    <p>Farad per meter</p> Signup and view all the answers

    What is the nature of the electromagnetic force?

    <p>Both attractive and repulsive</p> Signup and view all the answers

    What is the direction of the force exerted by a point charge on another point charge?

    <p>Radial to the line joining the two charges.</p> Signup and view all the answers

    What is the condition for the principle of superposition to be valid?

    <p>The charges must be stationary.</p> Signup and view all the answers

    What is the ratio of the electrostatic force and the gravitational force between two protons?

    <p>10^36 : 1</p> Signup and view all the answers

    What is the force between two point charges of 3 μC and 8 μC, if they are initially repelling each other with a force of 40 N?

    <p>40 N</p> Signup and view all the answers

    If two point charges of 1 μC and 5 μC are separated by a certain distance, what is the ratio of the electric field at a point midway between them?

    <p>1:5</p> Signup and view all the answers

    Two small balls having equal positive charge Q on each are suspended by two insulated strings of equal length L. In a state of weightlessness, what is the tension in the strings?

    <p>Q²/4πε₀L²</p> Signup and view all the answers

    If a charge of -5 μC is added to each of two point charges of 3 μC and 8 μC, initially repelling each other with a force of 40 N, what is the new force between them?

    <p>-10 N</p> Signup and view all the answers

    What is the change in potential at the surface of the shell when it is given a charge of –3Q?

    <p>–3Q / 4πε₀b</p> Signup and view all the answers

    What is the electric field at the surface of a charged sphere?

    <p>Q / 4πε₀r²</p> Signup and view all the answers

    What is the potential difference between two concentric spheres of radii a and b, with charges +Q and –Q respectively?

    <p>Q / 4πε₀(1/a – 1/b)</p> Signup and view all the answers

    What is the electric field at a point inside a charged spherical shell?

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

    What is the potential at the surface of a sphere of radius a with a charge +Q?

    <p>Q / 4πε₀a</p> Signup and view all the answers

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