An insulated rod when rubbed with a material acquires

Physics JAMB 1991

An insulated rod when rubbed with a material acquires

  • a negative charge if it is made of glass and rubbed with silk
  • no charge if it is made of glass and rubbed with fur checkmark
  • no charge if it is made of copper and rubbed with silk
  • a positive charge if it is made of copper and rubbed with fur

The correct answer is: B

Explanation

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