Dipole Moment Video Lessons

Concept

# Problem: Point charges q1 = -5 nC  and q2 = + 5 nC are separated by distance 3.30 mm, forming an electric dipole.A.) Find the magnitude (in coulomb meters)of the electric dipole moment.B.) What is the direction of the electric dipole moment?i.) from q2 to q1 ii.) from q1to q2C.)  The charges are in a uniform electric field whose direction makes an angle 36.9° with the line connecting the charges. What is the magnitude (in N/coulomb) of this field if the torque exerted on the dipole has magnitude 7.40×10−9N•m?

###### FREE Expert Solution

The magnitude of an electric dipole moment:

$\overline{){\mathbf{p}}{\mathbf{=}}{\mathbf{q}}{\mathbf{d}}}$

Torque in an electric dipole:

(A)

d = 3.30 mm(1m/1000mm) = 3.3 × 10-3 m

|q| = 5.0 nC(10-9C/1nC) = 5.0 × 10-9 C

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###### Problem Details

Point charges q1 = -5 nC  and q2 = + 5 nC are separated by distance 3.30 mm, forming an electric dipole.

A.) Find the magnitude (in coulomb meters)of the electric dipole moment.

B.) What is the direction of the electric dipole moment?

i.) from q2 to q1
ii.) from q1to q2

C.)  The charges are in a uniform electric field whose direction makes an angle 36.9° with the line connecting the charges.

What is the magnitude (in N/coulomb) of this field if the torque exerted on the dipole has magnitude 7.40×10−9N•m?