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An electric dipole of length 4 cm, when ...

An electric dipole of length 4 cm, when placed with its axis making an angle of `60^(@)` with a uniform electric field, experiences a torque of `4 sqrt(3) N m`. Calculate the
a. magnitude of the electric field, and
b. potential energy of the dipole, if the dipole has charges of `+- 8 n C`.

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