2020 Electrostatic Potential and CapacitanceElectric Potential due to an Electric Dipole Medium Question 32 of 76 in Electrostatic Potential and Capacitance

A short electric dipole has a dipole moment of $16\times10^{-9}\ C\,m$. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of $60^\circ$ with the dipole axis is: ($\frac{1}{4\pi\epsilon_0}=9\times10^9\ N\,m^2/C^2$)

A 200 V
B 400 V
C zero
D 50 V

The answer is A.

Solution

Potential due to a short dipole at a general point: $V = \frac{kp\cos\theta}{r^2}$ $V = \frac{9 \times 10^9 \times 16 \times 10^{-9} \times \cos 60^\circ}{(0.6)^2} = \frac{144 \times 0.5}{0.36}$ $V = 200$ V

Concept potential at a general point due to a dipole

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76 questions from this chapter have appeared across 27 exam years.