Assignment

An infinite line charge produces a field of $18\times {10}^{10} \mathrm{N} {\mathrm{C}}^{-1}$  at a distance of $1 \mathrm{m}.$ The linear charge density is

An electric dipole of dipole moment $p$ is enclosed in a hollow sphere of radius $R(R>I)$ where $I$ is length of dipole. The flux through the sphere is

The electric field due to a short dipole at a distance $\text{'}r\text{'}$ on its axis is

The angle between the electric dipole moment and the electric field strength due to it on the axial line is

The net torque acting on dipole placed in uniform electric field may be (symbols have usual meaning)

Which of the following is not a property of electrostatic field lines ?

The electric field is given by $\overrightarrow{\mathrm{E}}=(5\hat{i}+8\hat{j}+9\hat{k}),$ the electric flux through surface, whose area vector is given by $\overrightarrow{\mathrm{A}}=10\hat{i},$ would be

The directions of electric field at axial and equatorial point of a dipole are