EMC Question of the Week: March 23, 2026

depiction of two metal spheres and a schematic representation of their self and mutual capacitances

A metal sphere the size of a basketball (diameter = 24 cm) has an absolute capacitance of 13 pF. A metal sphere the size of a tennis ball (diameter = 6.7 cm) has an absolute capacitance of 3.7 pF. If they were separated by a distance of 10 cm, the measured capacitance between them would be about   

  1. 17 pF
  2. 13 pF
  3. 9.3 pF
  4. 3.7 pF

Reveal Question of the Week - Answer 260323