靜電學

Two insulated uncharged metal spheres $X$ and $Y$ are in contact with each other. A positively charged rod is brought near $X$ as shown above. Which of the following diagrams correctly shows the distribution of charges on the spheres ?

An uncharged light conducting sphere is suspended by an insulating thread. The metal dome of an operating Van de Graaff generator is brought near the sphere. Which of the following statements best describes the motion of the sphere ?

A positively charged rod is brought near an insulated uncharged metal sphere as shown in the figure. If the sphere is earthed with a finger,

In the figure shown, $X$ and $Y$ are two insulated metal spheres in contact with each other. A negatively charged object $C$ is brought near $X$. $X$ is touched momentarily with a finger, and then $X$ and $Y$ are separated. The charges on $X$ and $Y$ are

A positively-charged metal sphere is mounted on an insulating stand. When the sphere is earthed with a finger,

In the figure shown, an electron travels in a horizontal direction and enters a uniform electric field. The direction of the electric field is as shown. What is the direction of the force due to the electric field acting on the electron ?

The diagram shows two conducting spheres $X$ and $Y$ mounted on insulating stands. Sphere $X$ carries positive charges and sphere $Y$ carries negative charges. As $Y$ is moved slowly towards $X$ (but without touching $X$) the total charges on $X$

Two uncharged metal spheres are suspended by insulating threads as shown in the diagram. A plastic sheet is put between them. When a positively charged rod $X$ is brought near them as shown, which of the following diagrams shows the resulting charge distribution of the spheres ?