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  4. Electric field strength due to a dipole at a point on the axial line of dipole is

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Q. Electric field strength due to a dipole at a point on the axial line of dipole is

J & K CETJ & K CET 2006Electric Charges and Fields

Solution:

For a dipole having two charges $ +q $ and $ -q $ separated at a distance $2l$, the intensity of electric field at an axial point $P$ is given by $ E=\frac{1}{4\pi \varepsilon _{0}}\frac{2p}{r^{3}} $ where $p$ is dipole moment.
The direction of electric field $E$ is along the axis of the dipole from negative charge towards positive charge.

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