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Electricity and Magnetism

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Electron Positron Dipole

EANDM-NQF7YG

An electron and a positron are separated by an unknown distance $d$. At a distance of $R = 20 \:\mu \rm m$ directly along the line of the dipole, a potential $V_e = 1.8 \: \rm nV$ is measured due to the dipole. Given this information determine the value of the dipole separation $d$.

A

$2.5 \: \mu\rm m$

B

$0.5 \:\rm nm$

C

$1.0 \:\rm nm$

D

$37.2 \:\rm nm$

E

$5.5 \:\rm pm$