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NEET 2013
Exam
NEET
Year
2013
Subject
Physics
Chapter
Electrostatics

NEET 2013 · Physics · Electrostatics

An electric dipole of dipole moment p is aligned parallel to a...

An electric dipole of dipole moment pp is aligned parallel to a uniform electric field EE. The energy required to rotate the dipole by 90∘90^{\circ} is:

Options

  1. Ap2Ep^2 E
  2. BpEp E
  3. Cinfinity
  4. DpE3p E^3

Correct answer

B. pEp E

Step-by-step solution

Potential energy of dipoleU=−pE(cos⁡θ2−cos⁡θ1) Here θ2=0∘=−pE(cos⁡90−cos⁡θ)θ2=90∘UL=PE\begin{aligned}& U=-p E \\ & \left(\cos \theta_2-\cos \theta_1\right) \\ & \text{ Here } \quad \theta_2=0^{{}^{\circ}} \\ & =-p E \\ & (\cos 90-\cos \theta)\\ & \theta_2=90^{{}^{\circ}} \\ & \stackrel{L}{U}=P E \\ & \end{aligned}
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