• Demonstrate 1/r^2 dependence of Coulomb force.
• For accurate measurements, potential difference between charged
  spheres should be maintained using high-voltage power supply.
• For less-quantitative measurement, spheres can be charged
  with rod and fur. Charge on sphere can then be measured using proof plane,
  Faraday Ice Pail, and electrometer (right).

Location

• Coulomb Apparatus: L01, section A2.
• Proof plane: L01, section A2, plastic bin.
• Faraday Ice Pail: L01, A2.
• Electrometer: L01, A1.