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# chp25_2 - 2 Electric Charge Q esu electrostatic unit F = q...

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PHY2061 R. D. Field Department of Physics chp25_2.doc University of Florida Units MKS System ( meters-kilograms-seconds ): also Amperes, Volts, Ohms, Watts Force: F = ma Newtons = kg m / s 2 = 1 N Work: W = Fd Joule = Nm = kg m 2 / s 2 = 1 J Electric Charge: Q Coulomb = 1 C F = K q 1 q 2 /r 2 K = 8.99x10 9 Nm 2 /C 2 (in MKS system) CGS System ( centimeter-grams-seconds ): Force: F = ma 1 dyne = g cm / s 2 Work: W = Fd 1 erg = dyne-cm = g cm
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Unformatted text preview: 2 Electric Charge: Q esu ( electrostatic unit ) F = q 1 q 2 /r 2 K = 1 (in CGS system) Conversions ( MKS - CGS ): Force: 1 N = 10 5 dynes Work: 1 J = 10 7 ergs Electric Charge: 1 C = 2.99x10 9 esu Fine Structure Constant ( dimensionless ): α = K 2 π e 2 /hc (same in all systems of units) h = Plank’s Constant c = speed of light in vacuum We will use the MKS system!...
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