Linear charge density of wire is $8.85\,\mu C/m$ . Radius and height of the cylinder are $3\,m$ and $4\,m$ . Then find the flux passing through the cylinder
$5 \times 10^6\, volt-m$
$3 \times 10^6\, volt-m$
$4 \times 10^6\, volt-m$
None
An ellipsoidal cavity is carved within a perfect conductor. A positive charge $q$ is placed at the centre of the cavity. The points $A$ and $B$ are on the cavity surface as shown in the figure. Then
Figure shows the electric lines of force emerging from a charged body. If the electric field at $A$ and $B$ are ${E_A}$ and ${E_B}$ respectively and if the displacement between $A$ and $B$ is $r$ then
A cube of a metal is given a positive charge $Q$. For the above system, which of the following statements is true
Draw electric field lines when two positive charges are near.
Four closed surfaces and corresponding charge distributions are shown below
Let the respective electric fluxes through the surfaces be ${\phi _1},{\phi _2},{\phi _3}$ and ${\phi _4}$ . Then