A charged metallic ball is lowered into an insulated metal can.

The ball is made to touch bottom of the can. Then it is placed on the disc of electroscope shown below. Final

Two equally charged small metal balls placed at a fixed distance experience a force F. A similar unchanged metal ball after touching one of them is placed at the middle point between the two balls. The force experienced by this ball is

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

(A): A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field. (R ): X-rays emits photoelectron and metal becomes negatively charged.

(A): A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field. (R ): X-rays emits photoelectron and metal becomes negatively charged.