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| Charge on electron (e) | 1.60217634 × 10^{-19} C | 
| Avogadro’s number (NA) | 6.022142 × 10^{23} 1/mol | 
| Permeability of vacuum μ0 | 12.566370614 × 10^{-7} Vs/Am 4π × 10^{-7} Vs/Am | 
| Permittivity of vacuum ϵ0 | 8.854187817 × 10^{-12} As/Vm | 
