A charge particle is free to move in an electric field. It will travel
Always along a line of force
Along a line of force, if its initial velocity is zero
Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force
None of the above
In figure a point charge $+Q_1$ is at the centre of an imaginary spherical surface and another point charge $+Q_2$ is outside it. Point $P$ is on the surface of the sphere. Let ${\Phi _s}$be the net electric flux through the sphere and ${\vec E_p}$ be the electric field at point $P$ on the sphere. Which of the following statements is $TRUE$ ?
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
The figure shows the electric field lines of three charges with charge $+1, +1$, and $-1$. The Gaussian surface in the figure is a sphere containing two of the charges. The total electric flux through the spherical Gaussian surface is
What will be the total flux through the faces of the cube as in figure with side of length $a$ if a charge $q$ is placed at ?
$(a)$ $A$ $:$ a corner of the cube.
$(b)$ $B$ $:$ midpoint of an edge of the cube.
Three charges $q_1 = 1\,\mu c, q_2 = 2\,\mu c$ and $q_3 = -3\,\mu c$ and four surfaces $S_1, S_2 ,S_3$ and $S_4$ are shown in figure. The flux emerging through surface $S_2$ in $N-m^2/C$ is