Question

Convert the unit of energy from si system to cgs system (si unit of energy is joule)

Answer 1

To convert an SI formula to cgs: Change ε0 to 1/(4π×10−3c2) and µ0 to 4π×10−7. The “strange” factor 4π × 10−3c2 is just 4π × 10−7c2 in SI system.

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