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  • Need clarity, kindly explain! A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to

A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is

  • Option 1)

      – 2pE

  • Option 2)

    – pE

  • Option 3)

    pE

  • Option 4)

     2pE

 

Answers (1)

best_answer

As we have learned

Work done in rotation -

if \Theta _{1}=0^{\circ} \; and\; \Theta _{2}=\Theta            

\dpi{100} W=PE \left ( 1-\cos \Theta \right )

W= pE(1- \cos \theta ) here q = 180o

W = W= pE(1- \cos 180\degree )  = pE(1- (-1 ))= 2pE


Option 1)

  – 2pE

Option 2)

– pE

Option 3)

pE

Option 4)

 2pE

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