1.

An electric dipole is formed by two equal and opposite charges q with separation d. The charges the same mass m. It is kept in a uniform electric field E. If it slightly rotated from its equilibrium orientation, then its angular frequency ω is:(A) √(qE/2md)(B) √(2qE/md)(C) √(qE/md)(D) 2√(qE/md)

Answer»

ANSWER:

OPTION (B) √(2 q E / m d)

Explanation:

MOMENT of INERTIA (I) = m ( d / 2)^2 * 2

Now by τ= Iα

(q E)(d sinθ)=  m d^2α  / 2

⇒α=(  2 q E/m d )

⇒ Angular frequency ω =  √(2 q E / m d)

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