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# formulas - Formulas that might help in Physics 227 - be...

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Formulas that might help in Physics 227 - be careful - this is a plain text file =============== Formulae for 1st exam ============== ch 21 charges, conductors (no static E-field inside), insulators Coulombs law: Fc = k q1 q2 / r^2 E field: E = F_on_charge / q_of_charge E_of_point_charge = k q / r^2 superposition of fields: E_total = E_1 + E_2 + . .. field lines: start on +, end on -, don't touch or cross (also can go to/from r = infinity) electric dipoles: charges +/-q separated by a distance d dipole moment p = qd, in costant field U = p.E, F=0, torque T = pxE = pEsin(phi) ch 22 electric flux phi = int E . dA Gauss's Law phi = q_enc/eps_0 Eptcharge = (1/4 pi eps_0)(q/r^2) Eline = (1/2 pi eps_0) (lambda/r) Eplane = sigma/(2 eps_0) Ecapacitor = sigma/eps_0 ch 23 Upt = sum_charges (1/4 pi eps_0) q q_0/r V - do not multiply by q dV = E . dl, deltaV = int E . dl equipotentials E = - del . V = -[(d/dx) x-hat + (d/dy) y-hat + (d/dz) z-hat] V ch 24 Q = CV, C = eps_0 A / d caps in parallel add, in series add inversely

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## This note was uploaded on 01/18/2012 for the course 750 227 taught by Professor - during the Fall '09 term at Rutgers.

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formulas - Formulas that might help in Physics 227 - be...

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