A leaf electroscope is a device that indicates the existence of electric charge on an object. The leaves spread apart when an object is brought near or touches the electroscope. What observation would suggest that the object touched the electroscope?

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm