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.
        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 \( F \)

        • 3.
          Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).


            • 4.
              Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.


                • 5.
                  Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.


                    • 6.
                      A long solenoid of length \( L \) and radius \( r_1 \) having \( N_1 \) turns is surrounded symmetrically by a coil of radius \( r_2 \, (r_2>r_1) \) having \( N_2 \) turns (\( N_2 \ll N_1 \)) around its mid-point. Derive an expression for the mutual inductance of solenoid and coil. Is \( M_{12} = M_{21} \) valid in this case?

                        CBSE CLASS XII Previous Year Papers

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