Which among the curves shown in Figureb cannot possibly represent electrostatic field lines?
$(a)$ The field lines showed in $(a)$ do not represent electrostatic field lines because field lines must be normal to the surface of the conductor.
$(b)$ The field lines showed in $(b)$ do not represent electrostatic field lines because the field lines cannot emerge from a negative charge and cannot terminate at a positive charge.
$(c)$ The field lines showed in $(c)$ represent electrostatic field lines. This is because the field lines emerge from the positive charges and repel each other.
$(d)$ The field lines showed in $(d)$ do not represent electrostatic field lines because the field lines should not intersect each other.
$(e)$ The field lines showed in $(e)$ do not represent electrostatic field lines because closed loops are not formed in the area between the field lines.
A sphere of radius $R$ and charge $Q$ is placed inside a concentric imaginary sphere of radius $2R$. The flux associated with the imaginary sphere is
What is the direction of electric field intensity ?
Three positive charges of equal value $q$ are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in
A charge $q$ is surrounded by a closed surface consisting of an inverted cone of height $h$ and base radius $R$, and a hemisphere of radius $R$ as shown in the figure. The electric flux through the conical surface is $\frac{n q}{6 \epsilon_0}$ (in SI units). The value of $n$ is. . . .
A square surface of side $L$ meter in the plane of the paper is placed in a uniform electric field $E(volt/m)$ acting along the same plane at an angle $\theta$ with the horizontal side of the square as shown in figure.The electric flux linked to the surface, in units of $volt \;m $