Four charges $q, 2q, -4q$ and $2q$ are placed in order at the four corners of a square of side $b$. The net field at the centre of the square is
Four charges $q, 2q, -4q$ and $2q$ are placed in order at the four corners of a square of side $b$. The net field at the centre of the square is
- A
$\frac{q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- B
$\frac{5q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- C
$\frac{10q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- D
$\frac{20q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
Similar Questions
A point charge of $10\,\mu C$ is placed at the origin. At what location on the $X$-axis should a point charge of $40\,\mu\,C$ be placed so that the net electric field is zero at $x =2\,cm$ on the $X$-axis ?
A point charge of $10\,\mu C$ is placed at the origin. At what location on the $X$-axis should a point charge of $40\,\mu\,C$ be placed so that the net electric field is zero at $x =2\,cm$ on the $X$-axis ?
- [JEE MAIN 2023]
Two charges $q$ and $3 q$ are separated by a distance ' $r$ ' in air. At a distance $x$ from charge $q$, the resultant electric field is zero. The value of $x$ is :
Two charges $q$ and $3 q$ are separated by a distance ' $r$ ' in air. At a distance $x$ from charge $q$, the resultant electric field is zero. The value of $x$ is :
- [JEE MAIN 2024]
The acceleration of an electron in an electric field of magnitude $50\, V/cm$, if $e/m$ value of the electron is $1.76 \times {10^{11}}\,C/kg$, is
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The electric field intensity at a point in vacuum is equal to
The electric field intensity at a point in vacuum is equal to
Electric field at centre $O$ of semicircle of radius $a$ having linear charge density $\lambda$ given is given by
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- [AIPMT 2000]