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Question

Find out the magnitude of electric field intensity and electric potential due to a dipole of dipole moment ¯P=^i+3^j kept at origin at following points.
(i) (2, 0, 0)
(ii) (-1, 3, 0)

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Solution

E=kp|z|3z=2^ip=^i+3^jk=9×109E=9×109×108E=35.575×108V=p.^r4πε0r2r=^i+3^jr=12+32r=10V=(^i+3^j).(^i+3^j)4πε0×10V=9×10910×(1+3)V=95×109V=1.8×109

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