Electrostatics and Coulomb's Law Quiz
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Questions and Answers

What does Coulomb's Law state?

  • The electro-static force is directly proportional to the sum of charges and inversely proportional to the distance between them.
  • The electro-static force is inversely proportional to the product of charges and directly proportional to the square of the distance between them.
  • The electro-static force is inversely proportional to the sum of charges and directly proportional to the distance between them.
  • The electro-static force is directly proportional to the product of charges and inversely proportional to the square of the distance between them. (correct)

    • What is the relative permittivity (εr) of a medium?

  • The ratio of its force to the force of free space.
  • The ratio of its distance to the distance of free space.
  • The ratio of its charge to the charge of free space.
  • The ratio of its permittivity to the permittivity of free space. (correct)

    • What is the formula for the force on charge $q_1$ due to $q_2$ in vector form?

  • $\vec{F_{12}} = \frac{q_{1}}{r^{2}}\hat{r_{21}}$
  • $\vec{F_{12}} = \frac{q_{1}q_{2}}{r^{2}}\hat{r_{21}}$ (correct)
  • $\vec{F_{12}} = \frac{q_{1}q_{2}}{r}\hat{r_{21}}$
  • $\vec{F_{12}} = \frac{q_{1}q_{2}}{r^{3}}\hat{r_{21}}$

    • What is the value of K in Coulomb's Law in free space?

    <p>$9\times10^9 Nm^2C^{-2}$</p> Signup and view all the answers

    What happens to the right-hand side of the vector form of Coulomb force if $q_1q_2>0$?

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

    What does Coulomb's Law state?

    <p>The electro-static force between two charged bodies is directly proportional to the product of their charges and varies inversely as the square of the distance between the two bodies.</p> Signup and view all the answers

    What is the formula for the force between two charges in vector form?

    <p>$\vec{F_{12}} = \frac{q_{1}q_{2}}{r^{2}}\hat{r_{21}}$</p> Signup and view all the answers

    What is the value of K in Coulomb's Law in free space?

    <p>$K = 9\times10^{9} Nm^{2}C^{-2}$</p> Signup and view all the answers

    How is relative permittivity (εr) defined?

    <p>The ratio of the permittivity of a medium to the permittivity of free space.</p> Signup and view all the answers

    If q1 and q2 have the same sign, what can be said about the right-hand side of the vector form of Coulomb force?

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

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