A short electric dipole has dipole moment 4 10 -8 C m. At a point 0.2 m away on its axial line, the far-field electric potential is approximately:

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A short electric dipole has dipole moment 4 × 10-8 C m. At a point 0.2 m away on its axial line, the far-field electric potential is approximately:

Answer: 9.0 10 3 V.

A 9.0 × 103 V
B 1.8 × 104 V
C 4.5 × 103 V
D 3.6 × 104 V

Correct answer: A. 9.0 × 103 V

Explanation: For a short dipole, V = kp cosθ/r2. On the axis cosθ = 1, so V = 9 × 109 × 4 × 10-8/0.22 = 9.0 × 103 V.

Field lines always point from positive to negative charge, are denser where the field is stronger, and never cross; an isolated positive charge has lines radiating symmetrically outward, while a dipole's lines curve from the positive to the negative charge.

Concept context

Coulomb's law, electric field, potential, capacitors, Gauss's law.

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A short electric dipole has dipole moment 4 &times; 10<sup>-8</sup> C m. At a point 0.2 m away on its axial line, the far-field electric potential is approximately:

Concept context

More Electric Charges and Fields questions

A short electric dipole has dipole moment 4 × 10<sup>-8</sup> C m. At a point 0.2 m away on its axial line, the far-field electric potential is approximately: