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When a polythene tube is rubbed with a woollen cloth, the polythene tube

When a polythene tube is rubbed with a woollen cloth, the polythene tube Correct Answer becomes negatively charged while the cloth has a positive charge

Concept: 

  • Normally atoms have equal no of electrons and protons, so they are neutral.
  • When we rub any neutral object on another object, electrons in it move from one surface to another.
  • The surface that loose electron becomes positively charged.
  • The surface that gains electrons becomes negatively charged.
  • As electrons have a negative charge.

Explanation: 

  • Initially, polythene tube, as well as woolen cloth, is neutral.
  • When a polythene tube is rubbed with a woolen cloth,
  •  Electrons transfer from the woolen cloth to the polythene tube surface. 

Mistake Points

  •  When we rub any neutral object on another object, they do not produce new charges.
  • The charge is conserved in a process it just transfers from one place to another.

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