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JAMB Physics 1986 Question 46

Question 46

Electrostatics

The sign of the charge on a charged glass rod may be determined with

  1. A.a charged electroscope
  2. B.an uncharged electroscope
  3. C.a galvanometer
  4. D.an electrometer.
Show the answer and explanation

Answer: A (a charged electroscope)

Explanation

Bring the rod near an electroscope of known charge: if the leaves open further the charges are alike; an uncharged electroscope only shows that there is a charge.