electrostatics and magnetism

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THIS FILE WAS DOWNLOADED FROM THE IB NOTES SITE: http://ibnotes.tripod.com/ NOTES BY JAMES ROBERTSON, 2001 TOPIC 5— ELECTROSTATICS AND MAGNETISM: Charge of 1 electron = – 1.6 x 10 -19  C. 1 C of charge = 6.25 x 10 18  electrons. E = F q  — electric field acting on objects with charge. F = Force (N) q = Magnitude of Charge (C) E = El ec tr ic Fi el d Strengt h ( NC -1 ) Electrical potential difference (V) is related to the work (W) done to move a charge (q) as follows: V =  P.E. q  = W q  or W = qV Work is done, for example, when an electric charge is move against the electricity in an electric field, for example, to move a positive charge from A to B: B A PE A  > PE B Ele ctri cal po tent ial d iff eren ce is a lso c alle d volt age an d is me asur ed in vo lts . F = k  Q 1  Q 2 r 2  — Coulomb's Law— determines the force between 2 charges at a stated distance. k  = 1 4!ε 0  and is constant of proportionality. Its value is 9.0 x 10 9  N.m 2 .C -2 . Elect ri c Fie lds for Some Charge Dis tr ibutions: {SORRY THIS IMAGE CANNOT BE REPRODUCED} {Check your textbook.}  E  = k  Q 2 r 2  — The electric field strength due to an isolated point charge. I = q t  — Current— the rate of flow of charge in an electric circuit. Measured in amperes (A), or coulombs of charge per second. Conventi onal Cur re nt and El ectron Flow:

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