A positive point charge $+Q$ is fixed in space. A negative point charge $-q$ of mass $m$ revolves around fixed charge in an elliptical orbit. The fixed charge$+Q$ is at one focus of the ellipse. The only force acting on the negative charge is the electrostatic force due to the positive charge. Then which of the following statement is true?

An uncharged conducting ball $B$ lies inside a charged conductor $A$ as shown in the figure. $B$ is isolated from $A$.

A point charge $q$ is within an electrically neutral conducting shell whose outer surface is a sphere of radius $R$. The centre of outer surface is at $O$. Consider a point $P$ outside the conductor as shown in the figure. The magnitude of electric field at $P$

Two small balls $A$ and $B$ of positive charge $Q$ each and masses $m$ and $2m$, respectively, are connected by a non-conducting light rod of length $L$. This system is released in a uniform electric field of strength $E$ as shown. Just after the release (assume no other force acts on the system)