ELECTROSCOPE

A leaf electroscope is a simple apparatus to detect any charge on a body. It consists of two metal leaves OA and OB, free to rotate about O. Initially both are very slightly separated. When a charged object is touched to the metal knob at the top of the conducting rod, charge flows knob to the leaves through the conducting rod. As the leaves are now charges similarly, they start repelling each other and get separated, (deflected by certain angle). The angle of deflection in static equilibrium is an indicator of the amount of charge on the charged body. In an electroscope, both leaves are hinged at the top point O. Each leaf has mass m, length l and gets charge q. assuming the charge to be concentrated at ends A and B only, the small angle of deviation (theta) between the leaves in static equilibrium, is equal to :

A leaf electroscope is a simple apparatus to detect any charge on a body. It consist of two metal leaves OA and OB, free to rotate about O. Initially both are very slighty separted. When a charged object is touched to the metal knob at the top of the conduction re, charge flows from knob to the top of the conduction rod, charge flows from knob to the leaves through the conducting rod, charge flows from knob to the leaves through the conduction rod. As the leaves are now charged similarly, they start repelling each other and tet separted (deflected by certain angle). The angle of deflection in static equilibrium is an indicator of the amount of charge on the charged boy. If we perform these steps one by one. In which case, the leaves will converge (come closer), as compared to the previous state?

When a negative charged rod is brought near, but does not touch, the initially unchanged electroscope shown below, the leaves spring apart (I) . When the electroscope is then touched with a finger, the leaves collapse (II) . When next the finger and finally the rod are removed, the leaves spring apart a second time (III) . The charge on the leaves is

In an electroscope if a negatively charged body is brought in contact with the metal clip, the strips of the electroscope diverge. If now another charged object carrying equal amount of prositive charge is brought in contact with the clip, what will happen?