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JAMB Physics 1998 Question 37

Question 37

Electrostatics

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

  1. A.ebonite has a negative charge while glass has a positive charge
  2. B.ebonite has a positive charge while glass has a negative charge
  3. C.both have negative charges
  4. D.both have positive charges
Show the answer and explanation

Answer: A (ebonite has a negative charge while glass has a positive charge)

Explanation

Ebonite rubbed with fur gains electrons (negative); glass rubbed with silk loses electrons (positive). Unlike charges attract.