13 Electric Field Notes

P a g e 1 of 2 5 concepts in the gravitational field and in the electrical field topics. conservation law as w ell. T here are im portant analogies and distinctions betw een experience forces in electric and m agnetic fields. Like m ass - e n e r gy, charge obeys a m ass experiences a force in a gravitational field, a n d electrically - c harged objects seem s to be precisely quantised, w hile it is not clear if m ass is quantised . A n object w ith an attribute that appears to be just as fundam ental as m ass, o r e v e n m o re s o - c harge E lectrom agnetic interactions involve particles that have a property called electric charge, gravitational and electrom agnetic interactions. T opics sub - a tom ic level, a large num ber of daily hum an experiences can be explained by S ect©¥ons and and weak interactions. W hile the strong and weak interactions explain phenom ena at the L inks B etw een T here are four fundam ental forces in physics : the gravitational, e lectrom agnetic, s tro ng * ee space or air. (k) use the equation V - Q /4 ¨¡￡o' fo r the e le ctric pote ntia ©¥ in the fie ©¥d of a po int ch arg e in potential gradient at that point. ü) state that the field strength of the electric field at a point is num erica©¥ly equal to the bringing a sm all test charge from infinity to that point. «i) define electric potential at a point as the w ork done per unit positive charge in (h) describe the effect of a uniform electric field on the m otion of charged particles. (g) ca©¥cu©¥ate the forces on charges in uniform e©¥ectric fields. plates in term s of potential difference and plate separation. (f) calculate the e©¥ectric field strength of the uniform field betw een charged parallel space or air. (e) recall and use E - Ql4of 2 for the e lectric fie ld strength of a point cha rg e in free between tw o point charges in free space or air. (d) recall and use coulom b ' s law in the form F = Q q/4mof 2 for the e©¥ectric force ©­ 叼 electric field and gravitational field. (c) recognise the analogy betw een certain qualitative and quantitative aspects of (b) represent an electric field by m eans of field lines. positive charge placed at that point, force and define electric fie©¥d strength at a point as the electric force exerted per unit O utcom es (a) show an understanding of the concept of an e©¥ectric field as an exam p©¥e of a field of L earning C andidates should be ab©¥e to E lectric potentla©¥ tl ? (: n t t ©©& . . . L , J I k ) U niform electric fields 3 k u , $ E ©¥ectric f©¥eld of a point charge cT I T t \ E lectric force bew een po©¥nt charges /. . N v t \ t r C ontent C oncept of an e©¥ectric neld éÈ 团 团 1 3 e E C T R ©¥C F ©¥E L D 碘 嚇 i õ¹国fiį i

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P a g e 2 of 2 5 of energy conservation Lenz ' s law as circuits of energy in . c o nse rv atio n circuits of charges in conservation ' " ti. . infinitely extended planes external