Question

An electric dipole of moment $\overset{\rightarrow}{p}$ is placed normal to the lines of force of electric intensity $\overset{\rightarrow}{E}$ then the work done in deflecting it through an angle of 180⁰ is –

• A. pE
• B. 2pE
• C. –2pE
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

W = pE (cos 90⁰ – cos 270⁰) = 0