What is electrostatic force?

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Jasmine Grover

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Electrostatic force is one of the four fundamental forces in the universe that comes under electromagnetic force. The other forces include strong nuclear force, weak nuclear force, electromagnetic force, and gravitational force. 

  • Electrostatic force exists between 2 charged particles when they are placed at a distance.
  • Its magnitude depends upon the magnitude of each charge and the distance between these 2 charges.
  • When two like charges repel each other, an electrostatic force of repulsion is generated.
  • When two unlike charges attract each other then the electrostatic force of attraction is generated.

Electrostatic force

  • It is also called the Coulomb's force.
  • Coulomb’s law is used to calculate the force of the attraction or repulsion between two charged bodies.

F = kq1q2/r2

  • Here, k is the proportionality factor,
  • F is the magnitude of the force,
  • q1 and q2 are two electric charges,
  • and r is the distance between them.

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CBSE CLASS XII Related Questions

  • 1.
    Write two advantages of reflecting telescope over refracting telescope.


      • 2.
        An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.


          • 3.
            Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.


              • 4.
                Read the following paragraph and answer the questions that follow.
                A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.


                  • 5.
                    Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.


                      • 6.
                        A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.

                          CBSE CLASS XII Previous Year Papers

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