Explain What Happens When Amber is Rubbed with Wool or Silk.

When amber is rubbed with silk or wool, the amber becomes positively charged due to static electricity. Charges can be classified as positive and negative charges. Like charges repel each other whereas the unlike charges attract each other. The force between the charges decreases as the distance between them increases.

When a glass rod is rubbed with amber, electrons are transferred from the glass rod to amber leaving it with a slightly greater positive charge and the amber rod acquires a negative charge.

What is static electricity?

Static electricity is an imbalance between the electric charges in a body, specifically the imbalance between negative and positive charges on a body. Static electricity is mainly produced due to the contact between solid objects.

Characteristics of static electricity

The characteristics of static electricity are as follows:

  1. There are two types of charges – positive and negative charge.
  2. Like charges repel each other whereas unlike charges attract each other.
  3. As the distance between charges increases, the force between them decreases.

Related Questions

  1. What Are Two Kinds Of Electricity?
  2. Can rubbing cause static electricity
  3. Write a short note on static electricity.
  4. Where do we use static electricity in everyday life?
  5. What is the major difference between static electricity and current electricity?

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CBSE CLASS XII Related Questions

  • 1.
    An astronomical telescope consists of two converging lenses. One of them of large aperture and large focal length is called objective lens and the other one, of smaller focal length and smaller aperture is called the eyepiece. It is used to see distant objects which are not seen clearly with naked eyes. The image formed by the objective lens acts as an object for the eyepiece and the final image produced by the eyepiece is magnified.


      • 2.
        Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

          • \( (M_x - M_z)<M_y \)
          • \( (M_x - M_y)<M_z \)
          • \( M_x>(M_y + M_z) \)
          • \( M_x<(M_y + M_z) \)

        • 3.
          Write two advantages of reflecting telescope over refracting telescope.


            • 4.
              A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.


                • 5.
                  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.


                    • 6.
                      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.

                        CBSE CLASS XII Previous Year Papers

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