Introduction to Electrodynamics · Problem 2.32

Electrostatics — David J. Griffiths

Physics · energy-two-point-charges-string

Problem

Two positive point charges,

q_A

and

q_B

(masses

m_A

and

m_B

) are at rest, held together by a massless string of length

a

. Now the string is cut, and the particles fly off in opposite directions. How fast is each one going, when they are far apart?