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Engineering
12 months ago

Help me answer: - Electrostatics - JEE Main-6

An electric dipole of moment \vec{p} placed in a uniform electric field \vec{E} has minimum potential energy when the angle between \vec{p} and \vec{E}  is

  • Option 1)

    zero 

  • Option 2)

    \pi/2

  • Option 3)

    \pi

  • Option 4)

    3\pi/2

 
Answers (1)
81 Views
A aadil.khan
Answered 12 months ago

As we have learned

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}

-

 

 U= -pE \cos \theta It has minimum value when q = 0o

   i.e.U_min= -pE \times \cos 0 \degree= -pE

 


Option 1)

zero 

Option 2)

\pi/2

Option 3)

\pi

Option 4)

3\pi/2

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