A table tennis ball covered with a conducting paint is suspended by a silk thread so that it hangs between tow metal plates. One plate is earthed, when the other plate is connected to a high voltage generator, what will happen to the ball.

When a parallel plate capacitor is charged by connecting it across a battery then battery is disconnected. If one plate of capacitor is earthed and isolated then another plate is connected to earth and then isolated. What will be the final charge on the capacitor after this operation. Will it be less than, equal to or more than the initial charge? Explain why?

What happens when two moving plates of earth's crust collide head on with each other ?

Two vertical metallic plates carrying equal and opposite charges are kept parallel to each other like a parallel plate capacitor. A small spherical metal ball is suspended by a long insulated thread such that it hangs freely in the centre of the two metallic plates. The ball which is uncharged is taken slowly towards the positively charged plate and is made to touch that plate. Then the ball will

One of two parallel conducting plates separated by a distance 2 cm is charged to a potential 1800V, and the outer plate is connected to the earth. What is the magnitude of the electric field intensity in the space between the two plates?

A small pith ball of mass 0.3 g is suspended by a weightless thread between two vertical parallel plates, separated by a distance of 5 cm. The ball carries a charge of 49 esu. What potential difference should be applied between the plates so that the thread is deflected by 45^(@) from the vertical?

Consider an evacuated cylindrical chamber of height h having rigid conducting plates at the ends and an insulating curved surface as shown in the figure. A number of spherical balls made of a light weight and soft material and coated with a conducting material are placed on the bottom plate. The balls have a radius r lt lt h . Now, a high voltage source (HV) is connected across the conducting plates such that the bottom plate is at +V_0 and the top plate at -V_0 . Due to their conducting surface, the balls will get charged, will become equipotential with the plate and are repelled by it. The balls will eventually collide with the top plate, where the coefficient of restitution can be taken to be zero due to be soft nature of the material of the balls. The electric field in the chamber can be considered to be that of a parallel plate capacitor. Assume that there are no collisions between the balls and the interaction between them is negligible. (Ignore gravity) Which one of the following statements is correct ?