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Potential energy of a dipole in external field - class-XII

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Multiple Choice

An electric dipole of length $20cm$ having $\pm 3\times { 10 }^{ -3 }C$ charge placed at ${60}^{o}$ with respect to a uniform electric field experiences a torque of magnitude $6Nm$. The potential energy of the dipole is

  1. $-2\sqrt{3}J$
  2. $5\sqrt{3}J$
  3. $-2\sqrt {2}J$
  4. $3\sqrt {5}$
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