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 (B)</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 (C)</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 (B)</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 (C)</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 (D)</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 (D)</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° (C)</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 (A)</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 (C)</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 (B)</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 (A)</p> Signup and view all the answers

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

<p>10^37 (B)</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 (C)</p> Signup and view all the answers

What is the unit of the permittivity of free space?

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

What is the nature of the electromagnetic force?

<p>Both attractive and repulsive (A)</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. (A)</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. (A)</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 (B)</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 (B)</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 (D)</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 (C)</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 (D)</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 (D)</p> Signup and view all the answers

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

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

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

<p>Zero (D)</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 (B)</p> Signup and view all the answers

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