Need help on making magnetic launcher

TheAnalogKid83

ESR = equivalent series resistance, and its the parasitic resistance of the capacitor. This is not written on the package usually, and you need to look at the datasheet. The ESR is highly dependent on the technology and materials of the capacitor. Some datasheets will explicitly state the ESR, while others will only give you a dissipation factor or loss tangent which you can use in equations to derive an ESR.