CBSE Class-1 Physics Electric Charges and Fields Revision
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Questions and Answers

What is the relationship between the total charge (q) of a body and the basic quantum of charge (e)?

  • $q = e/n$ where $n = 0, ±1, ±2, ±3, …$
  • $q = ne$ where $n = 0, ±1, ±2, ±3, …$ (correct)
  • $q = e^2/n$ where $n = 0, ±1, ±2, ±3, …$
  • $q = n/e$ where $n = 0, ±1, ±2, ±3, …$

What does the Superposition Principle state?

  • The total charge of an isolated system remains uncharged with time.
  • The electric field at a point due to a charge configuration varies inversely as the square of its distance from Q.
  • The mutual electrostatic force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance separating them.
  • The properties of forces with which two charges attract or repel each other are not affected by the presence of additional charges. (correct)

What does Coulomb's Law describe?

  • The mutual electrostatic force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance separating them. (correct)
  • The radially outwards or inwards nature of the electric field at a point due to a charge.
  • The plot of electric field versus distance from Q.
  • The force on a small positive test charge placed at a point divided by its magnitude.

What is the nature of the electric field at a point if q is negative?

<p>Radially inwards (A)</p> Signup and view all the answers

Which property reflects that conductors allow movement of electric charge through them?

<p>Conductivity (A)</p> Signup and view all the answers

What is the relationship between the electric field E at a point and the distance r from the charge Q?

<p>The relationship is given by the equation $E = \frac{1}{4\pi\varepsilon_0} \frac{q}{r^2}$, where $E$ is the electric field, $\varepsilon_0$ is the vacuum permittivity, $q$ is the charge, and $r$ is the distance from the charge.</p> Signup and view all the answers

Explain the quantization of electric charge.

<p>The quantization of electric charge means that the total charge (q) of a body is always an integral multiple of a basic quantum of charge (e), given by the equation $q = ne$, where $n = 0, \pm1, \pm2, \pm3, \ldots$</p> Signup and view all the answers

Describe Coulomb's Law and the factors affecting the mutual electrostatic force between two point charges.

<p>Coulomb's Law states that the mutual electrostatic force between two point charges $q_1$ and $q_2$ is proportional to the product $q_1q_2$ and inversely proportional to the square of the distance $r_{12}$ separating them. The factors affecting the force are the magnitudes of the charges and the distance between them.</p> Signup and view all the answers

Explain the Superposition Principle in the context of forces between charges.

<p>The Superposition Principle states that the properties of forces with which two charges attract or repel each other are not affected by the presence of a third (or more) additional charge(s). In other words, the total force on a charge due to a system of charges is the vector sum of the individual forces exerted on that charge by the other charges in the system.</p> Signup and view all the answers

What is the significance of conductors and insulators in the context of electric charges and fields?

<p>Conductors allow movement of electric charge through them, while insulators do not. This property is significant in understanding the behavior of electric charges and the formation of electric fields in different materials.</p> Signup and view all the answers

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