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Write a short note on static electricity.

Static electricity refers to the imbalance of electric charges on the surface or between or within a material.

  • When an object is negatively charged, the other one becomes positively charged when they are closer. The constant rubbing of these two objects creates an electron imbalance and a buildup of self-produced current produces static electricity.
  • This is observed in both insulators and conductor. For instance, sticking of hair to the wool of a hat is a result of this.
  • This phenomenon is more common in the dry season as moisture prevents electron transfer.

Related Questions

  1. What Are Two Kinds Of Electricity?
  2. Can rubbing cause static electricity
  3. Where do we use static electricity in everyday life?
  4. What is balance point in potentiometer?
  5. What is the major difference between static electricity and current electricity?
  6. How is potential gradient measured?

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CBSE CLASS XII Related Questions

  • 1.
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      • 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.
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    • 2.
      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.

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        • 3.
          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:

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            • repel with a force \( \frac{F}{2} \)
            • repel with a force \( F \)
            • attract with a force \( F \)
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          • 4.
            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?

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              • 5.
                Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

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                  • 6.
                    What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

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