Coulomb vs Hooke

Electricity and Magnetism Level 4

There are two identical charges attached to the ends of a spring. How far apart are they if the system is in equilibrium (neglecting gravity)?

System Parameters (All in SI units):

ChargeCoulomb's constantSpring constantSpring unstretched length
\(q = 10^{-4} C \)\(k = 9\times10^9 \text{ Nm}^2 \text{ C}^{-2} \)\(\alpha = 90\text{ Nm}^{-1} \)\(L = 1\text{ m} \)

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