What is a point charge?

  • A
    $A$ charge with zero mass.
  • B
    $A$ charge whose size is negligible compared to the distance between it and other charges.
  • C
    $A$ charge that exists only at the origin.
  • D
    $A$ charge that is always positive.

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How can you represent experimentally that $(i)$ there are two types of charges and $(ii)$ there is repulsion between two like charges and attraction between two unlike charges?

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Describe the activity to construct a simple electroscope.

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