86. A copper ball with a diameter of 1 cm is placed in oil. Oil density ρ = 800 kg / m3. What is the charge of the ball, if in a uniform electric field the ball is suspended in oil? The electric field is directed vertically upward, and its intensity is E = 35 kV / cm.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)