Two point charges

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electrostatic fields and potential · Electrostatic fields and potential

The Boundary-Value Problem, Ch The multipole expansion of the potential

Problem

Two point charges, each

+q

with

q=5.0\,\mathrm{nC}

, are fixed at

(a,0,0)

and

(0,a,0)

with

a=3.0\,\mathrm{cm}

. Take the origin as stated. ((a)) Find the total charge of the pair. ((b)) Find the dipole moment about the origin, giving its magnitude and its direction relative to the

x

-axis. ((c)) Can this dipole moment be treated as the leading non-vanishing term for computing the potential far from the pair? Explain, referring to how each term of the multipole expansion falls with distance.

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