Question 470: Electrostatics & Capacitance

Question

An electric field of 1000 V/m is applied to an electric dipole at angle of 45
o
. The value of electric dipole moment is 10
–29
C.m. What is the potential energy of the electric dipole?

Accepted Answer

U = $-$ $\overrightarrow P .\overrightarrow E $
= $-$ PE cos $	heta $
= $-$ (10
$-$29
) (10
3
) cos 45
o
= $-$ 0.707 $ 	imes $ 10
$-$26
J
= $-$ 7 $ 	imes $ 10
$-$27
J.

Answer

- 7 $ 	imes $ 10
–27
J

Answer

$-$ 9 $ 	imes $ 10
–20
J

Answer

$-$ 10 $ 	imes $ 10
–29
J

Answer

$-$ 20 $ 	imes $ 10
–18
J

Electrostatics & Capacitance

An electric field of 1000 V/m is applied to an electric dipole at angle of 45 o . The value of electric dipole moment is 10 –29 C.m. What is the potential energy of the electric dipole?

Choose the correct answer: