Which instrument is used to detect the charge on a body? Explain it with a diagram.

(N/A) simple apparatus used to detect the charge on a body is the gold-leaf electroscope,as shown in the figure.
It consists of a vertical metal rod housed in a box,with two thin gold leaves attached to its bottom end.
When a charged object touches the metal knob at the top of the rod,the charge flows onto the leaves,causing them to diverge due to electrostatic repulsion.
The degree of divergence is an indicator of the amount of charge present on the body.