When a charged body touches the rod of the electrometer, the charges are distributed along the conductors – the arrow and the rod. Repulsive forces act between the electric charges of the same name on the rod and arrow, which cause the arrow to turn. The greater the electric charge is imparted to the electrometer, the greater the angle the arrow is deflected.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.