The given diagram shows two semi infinite line of charges having equal (in magnitude) linear charge density but with opposite sign. The electric field at any point on $x$ axis for $(x > 0)$ is along the unit vector
$\cos \theta \,\hat i + \sin \theta \,\hat j$
$\hat i$
$\hat j$
$ - \sin \theta \,\hat i + \sin \theta \,\hat j$
The three charges $q / 2, q$ and $q / 2$ are placed at the corners $A , B$ and $C$ of a square of side ' $a$ ' as shown in figure. The magnitude of electric field $(E)$ at the comer $D$ of the square, is
Explain electric field and also electric field by point charge.
A charged particle of mass $0.003\, gm$ is held stationary in space by placing it in a downward direction of electric field of $6 \times {10^4}\,N/C$. Then the magnitude of the charge is
For a uniformly charged ring of radius $R$, the electric field on its axis has the largest magnitude at a distance $h$ from its centre. Then value of $h$ is
A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy $X$ -ray beam falls on the ball, then the ball