Two small identical carrying the charges of the same sign are suspended from the same point by insulating threads of equal length. When the surrounding space was filled with kerosene the divergence angle between the threads remained constant. What is the density of the material of which the are made?
In air the forces are as shown. In K-oil,
Since the inclinations do not change
where ρ0 is the density of K-oil and p that of the material of which the ***** are made.
