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JAMB Physics 1981 Question 27

Question 27

Electrostatics

Which of the following statements is CORRECT?

  1. A.Charges generated on glass rubbed with silk are called negative
  2. B.Charges in various media can be carried by protons detached from their atoms.
  3. C.The magnitude of any charge is a multiple of the charge of an electron
  4. D.The intensity of an electric field is a scalar quantity
  5. E.If 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two points is 100 V.
Show the answer and explanation

Answer: C (The magnitude of any charge is a multiple of the charge of an electron)

Explanation

Charge comes in whole-number multiples of the electronic charge. Glass rubbed with silk becomes positive, field intensity is a vector, and 500 J ÷ 2 C = 250 V, not 100 V.