Question

state the working principle of an electric screen​

Answer 1

The simplest Vibrating Screen Working Principle can be explained using the single deck screen and put onto an inclined frame. The frame is mounted on springs. The vibration is generated from an unbalanced flywheel. A very erratic motion is developed when this wheel is rotated.

Answer 2

Answer:

Let,a gold-leaf electroscope enclosed in a wire-gauge cage C is placed on an insulated base A.now if a charge body is brought near to or in contact with the cage,no effect is produced on the electroscope because charge resides on the outer surface of the cage,not inside.So the region enclosed by the cage is free from external electric al influence.