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Deduce an expression for the electric fi...

Deduce an expression for the electric field E due to a dipole of length '2a' at a point distant 'r' from the centre of the dipole on the axial line.
(b) Draw a graph of E versus r for ` r gt gt a. `
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E-r graph for ` r gt gt a `shown in figure
The positions of stable and unstable equilibrium have represented in in Both positions , torque acting on the dipole is zero.
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