Physics

Problem

Two identical electric point dipoles have dipole moments

\vec{P}_1 = P\hat{i}

and

\vec{P}_2 = -P\hat{i}

and are held on the

x

axis at distance 'a' from each other. When released, they move along

x

-axis with the direction of their dipole moments remaining unchanged. If the mass of each dipole is 'm', their speed when they are infinitely far apart is : a.

\frac{P}{a} \sqrt{\frac{1}{\pi \epsilon_0 ma}}

\frac{P}{a} \sqrt{\frac{1}{2\pi \epsilon_0 ma}}

\frac{P}{a} \sqrt{\frac{2}{\pi \epsilon_0 ma}}

\frac{P}{a} \sqrt{\frac{2}{2\pi \epsilon_0 ma}}

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