There are two uncharged identical metallic spheres $1$ and $2$ of the radius $r$ separated by a distance $d\left(d>>r\right)$. A charged metallic sphere of the same radius having charge $q$ is touched with one of the spheres. After some time it is moved away from the system. Now the uncharged sphere is earthed. Charge on the earthed sphere is

A negative charge is moved by an external agent in the direction of electric field. Then

Which of the following is true for the figure showing electric lines of force? ($E$ is an electrical field, and $V$ is potential.)

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

For the situation shown in figure, mark the correct statement(s).

A wire having a uniform linear charge density $\lambda$ is bent in the form of a ring of radius $R$. The point $A$ as shown in the figure is in the plane of the ring but not at the center. Two elements of the ring of lengths $a_1$ and $a_2$ subtend very small same angle at a point $A$. They are at distances $r_1$ and $r_2$ from the point $A$, respectively $\left(r_2>r_1\right)$