The electric field in a region is given $\vec E = a\hat i + b\hat j$ . Here $a$ and $b$ are constants. Find the net flux passing through a square area of side $l$ parallel to $y-z$ plane
$al^2$
$bl^2$
Zero
$(a + b)\,l^2$
The electric field in a region is radially outward with magnitude $E = A{\gamma _0}$. The charge contained in a sphere of radius ${\gamma _0}$ centered at the origin is
If a charge $q$ is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be
Assertion : Four point charges $q_1,$ $q_2$, $q_3$ and $q_4$ are as shown in figure. The flux over the shown Gaussian surface depends only on charges $q_1$ and $q_2$.
Reason : Electric field at all points on Gaussian surface depends only on charges $q_1$ and $q_2$ .
The given figure gives electric lines of force due to two charges $q_1$ and $q_2$. What are the signs of the two charges?
What is the direction of electric field intensity ?