What is an electric dipole? Write its $SI$ unit.
(N/A) An electric dipole is a system of two equal and opposite point charges separated by a finite distance.
If $2a$ is the distance between two charges $q$ and $-q$,the dipole moment of this system is given by $\vec{p} = q(2\vec{a})$. Electric dipole moment is a vector quantity,and its direction is from the negative charge to the positive charge.
The $SI$ unit of electric dipole moment is $Cm$ (Coulomb-meter). Its dimensional formula is $[M^0 L^1 T^1 A^1]$.
The total charge of the dipole system is zero,but its electric field is non-zero because the two opposite charges are situated at different positions.
If $2a$ is the distance between two charges $q$ and $-q$,the dipole moment of this system is given by $\vec{p} = q(2\vec{a})$. Electric dipole moment is a vector quantity,and its direction is from the negative charge to the positive charge.
The $SI$ unit of electric dipole moment is $Cm$ (Coulomb-meter). Its dimensional formula is $[M^0 L^1 T^1 A^1]$.
The total charge of the dipole system is zero,but its electric field is non-zero because the two opposite charges are situated at different positions.
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Similar Questions
The force of interaction between two co-axial short electric dipoles whose centers are $R$ distance apart varies as:
Medium
View SolutionList-$I$ shows four configurations,each consisting of a pair of ideal electric dipoles. Each dipole has a dipole moment of magnitude $p$,oriented as marked by arrows in the figures. In all the configurations,the dipoles are fixed such that they are at a distance $2r$ apart along the $x$-direction. The midpoint of the line joining the two dipoles is $X$. The possible resultant electric fields $\vec{E}$ at $X$ are given in List-$II$. Choose the option that describes the correct match between the entries in List-$I$ to those in List-$II$.
List-$I$ List-$II$ $(P)$ Two dipoles pointing in $+\hat{j}$ direction at $x = -r$ and $x = +r$ $(1) \ \vec{E}=0$ $(Q)$ Two dipoles pointing in $+\hat{j}$ and $-\hat{j}$ direction at $x = -r$ and $x = +r$ respectively $(2) \ \vec{E}=-\frac{p}{2 \pi \epsilon_0 r^3} \hat{j}$ $(R)$ Two dipoles pointing in $+\hat{j}$ and $+\hat{i}$ direction at $x = -r$ and $x = +r$ respectively $(3) \ \vec{E}=-\frac{p}{4 \pi \epsilon_0 r^3}(\hat{i}-\hat{j})$ $(S)$ Two dipoles pointing in $+\hat{i}$ direction at $x = -r$ and $x = +r$ $(4) \ \vec{E}=\frac{p}{4 \pi \epsilon_0 r^3}(2\hat{i}-\hat{j})$ $(5) \ \vec{E}=\frac{p}{\pi \epsilon_0 r^3} \hat{i}$
| List-$I$ | List-$II$ |
| $(P)$ Two dipoles pointing in $+\hat{j}$ direction at $x = -r$ and $x = +r$ | $(1) \ \vec{E}=0$ |
| $(Q)$ Two dipoles pointing in $+\hat{j}$ and $-\hat{j}$ direction at $x = -r$ and $x = +r$ respectively | $(2) \ \vec{E}=-\frac{p}{2 \pi \epsilon_0 r^3} \hat{j}$ |
| $(R)$ Two dipoles pointing in $+\hat{j}$ and $+\hat{i}$ direction at $x = -r$ and $x = +r$ respectively | $(3) \ \vec{E}=-\frac{p}{4 \pi \epsilon_0 r^3}(\hat{i}-\hat{j})$ |
| $(S)$ Two dipoles pointing in $+\hat{i}$ direction at $x = -r$ and $x = +r$ | $(4) \ \vec{E}=\frac{p}{4 \pi \epsilon_0 r^3}(2\hat{i}-\hat{j})$ |
| $(5) \ \vec{E}=\frac{p}{\pi \epsilon_0 r^3} \hat{i}$ |
Two opposite and equal charges $4 \times 10^{-8} \, C$ are placed $2 \times 10^{-2} \, cm$ apart,forming a dipole. If this dipole is placed in an external electric field of $4 \times 10^8 \, N/C$,what are the values of the maximum torque and the work done in rotating it through $180^\circ$?
Medium
View Solution$A$ system of three charges is placed as shown in the figure. If $D >> d$,the potential energy of the system is best given by:
DifficultJEE MAIN 2019
View SolutionAn electric dipole of dipole moment $p$ is aligned parallel to a uniform electric field $E$. The energy required to rotate the dipole by $90^{\circ}$ is $\left[\begin{array}{ll}\sin 0^{\circ}=0, & \sin 90^{\circ}=1 \\ \cos 0^{\circ}=1, & \cos 90^{\circ}=0\end{array}\right]$
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