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Q.

A short electric dipole has a dipole moment of  16×109Cm. The electric potential due to the dipole at a point at a distance of 1.2 m from the centre of the dipole, situated on a line making an angle of 60o with the dipole axis is : 14πε0=9×109Nm2/C2

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a

200 V

b

400 V

c

Zero

d

50 V

answer is D.

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Detailed Solution

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Potential due to a dipole at any point is
given by v=pcosθ4πϵ0r2

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Here, p = 16×109Cm

r = 0.6 m

14πϵ0=9×109Nm2/C2

θ=60

Substituting the values,

V=16×109×12×9×109144×102=50 V

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A short electric dipole has a dipole moment of  16×10−9Cm. The electric potential due to the dipole at a point at a distance of 1.2 m from the centre of the dipole, situated on a line making an angle of 60o with the dipole axis is : 14πε0=9×109N m2/C2