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The sign convention from friction

Exercise and reference answers

Questions
  1. Question
    A glass rod rubbed with silk carries
    Choices
    1. negative charge
    2. positive charge
    3. no charge
    Correct choice
    positive charge
  2. Question
    A plastic rod rubbed with fur carries
    Choices
    1. positive charge
    2. no charge
    3. negative charge
    Correct choice
    negative charge
  3. Question
    Two like charges
    Choices
    1. repel
    2. attract
    3. do nothing
    Correct choice
    repel
  4. Question
    Two unlike charges
    Choices
    1. repel
    2. attract
    3. do nothing
    Correct choice
    attract

Explanation

syllabus fixes the convention with two specific pairs. Source: syllabus Physics Part I, Ch 1 Electric Charges and Fields.
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