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  • Help me answer: If we place an electric dipole S in a uniform electric field W. The dipole has minimum potential energy when angle between S and W in degrees will be

If we place an electric dipole S in a uniform electric field W. The dipole has minimum potential energy when angle between S and W in degrees will be

  • Option 1)

    30

  • Option 2)

    70

  • Option 3)

    90

  • Option 4)

    Zero

 

Answers (1)

best_answer

As we learnt in 

Work done in rotation -

if\; \Theta _{1}= 90^{\circ}\; and \; \Theta _{2}=\Theta

\dpi{100} W=U=-PE\cos \Theta

U=-\vec{P}\cdot \vec{E}

-

 

Energy of dipole is =-\vec{p}.\vec{E}

Energy is minimum =-pE\cos \theta

When \theta = 0


Option 1)

30

This option is incorrect

Option 2)

70

This option is incorrect

Option 3)

90

This option is incorrect

Option 4)

Zero

This option is correct

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Plabita

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