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Q. An electric dipole is formed two particles fixed at the ends of a light rigid rad of length 1 The mass of each particle is m and chaises are -q and +q The system s suspended by a torsionless thread in ah electric field,of intensity E such that the dipole axis is parallel to the field if it is slightly displaced, the period of angular motion

Electrostatic Potential and Capacitance

Solution:

Correct answer is (c) $2\pi \sqrt{\frac{ml}{2qE}}$