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.
    Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.


      • 2.
        Write any two features of nuclear forces.


          • 3.
            Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.


              • 4.
                Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

                  • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
                  • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
                  • Assertion (A) is true, but Reason (R) is false.
                  • Both Assertion (A) and Reason (R) are false.

                • 5.
                  Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

                    • attract with a force \( \frac{F}{2} \)
                    • repel with a force \( \frac{F}{2} \)
                    • repel with a force \( F \)
                    • attract with a force \( F \)

                  • 6.
                    Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

                      CBSE CLASS XII Previous Year Papers

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