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An electric dipole of mass m, charge q, and length l is placed in a uniform electric field → E = E 0 i ˆ . When the dipole is rotated slightly from its equilibrium position and released, the time period of its oscillations will be :

1. π 2 1 0 qE m 2 l
2. 2 π 0 qE m l
3. π 2 1 0 qE 2 m l
4. 2 π 0 qE 2 m l

Correct answer: 2 π 0 qE 2 m l

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