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?

$9\times10^9 Nm^2C^{-2}$ (D) Signup and view all the answers

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

It is positive (C) Signup and view all the answers

What does Coulomb's Law state?

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. (C) Signup and view all the answers