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.

    A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.


      • 2.

        (I) The real image of an object placed between $f$ and $2f$ from a convex lens can be seen on a screen placed at the image location. If the screen is removed, is the image still there? Explain.

        (II) Plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.


          • 3.

            A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:

            (I) the formation of maxima and minima in the diffraction pattern, and

            (II) why the maxima go on becoming weaker and weaker with its increasing number $n$.


              • 4.
                In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

                  • \(10\ \text{N/C}\) along \(+x\)
                  • \(10\ \text{N/C}\) along \(-x\)
                  • \(50\ \text{N/C}\) along \(+x\)
                  • \(50\ \text{N/C}\) along \(-x\)

                • 5.

                  Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.


                    • 6.
                      The resistance of a metal wire at \(20^\circ\text{C}\) is \(1.05\,\Omega\) and at \(100^\circ\text{C}\) is \(1.38\,\Omega\). Determine the temperature coefficient of resistivity of this metal.

                        CBSE CLASS XII Previous Year Papers

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