Q
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)

$3\pi/2$

81 Views

As we have learned

Work done in rotation -

$\dpi{100} if\; \Theta _{1}= 90^{\circ}\; and \; \Theta _{2}=\Theta$

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

$\dpi{100} U=-\vec{P}\cdot \vec{E}$

-

$U= -pE \cos \theta$ 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)

$3\pi/2$

Test Series JEE Main January 2020 Maths
Exams
Articles
Questions