Electric charges $q, q, -2q$ are placed at the corners of an equilateral triangle $ABC$ of side $l$. The magnitude of the electric dipole moment of the system is

$A$ dipole with dipole moment $p$ and moment of inertia $I$ is placed in a uniform electric field $E$. If it is displaced slightly from its stable equilibrium position,the period of oscillation of the dipole is

$A$ system of three charges is placed as shown in the figure. If $D >> d$,the potential energy of the system is best given by:

$A$ given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force $F$. If the distance of the charge is doubled,the force acting on the charge will be:

Two point charges $-q$ and $+q$ are placed at a distance of $L$,as shown in the figure. The magnitude of electric field intensity at a distance $R$ $(R \gg L)$ varies as:

An electric dipole placed in a uniform electric field experiences maximum torque when the dipole is placed: