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: