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B Fe H Fe

iron core. B Fe H Fe. B gap H gap. gap region. i. coil windings. B air H air. thickness t. width L. q = - e. area A. electrons are the charge carriers in copper. + + + + + + + + +. dy. + + + + + + + + +. F. - - - - - - - - -.

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B Fe H Fe

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  1. iron core BFe HFe Bgap Hgap gap region i coil windings Bair Hair

  2. thickness t width L q = - e area A electrons are the charge carriers in copper

  3. + + + + + + + + + dy + + + + + + + + + F - - - - - - - - - -q +q

  4. Induced dipole moment – helium atom +2e +2e -e -e -e -e Zero electric field – helium atom symmetric  zero dipole moment A B effectively charge +2e at A and -2e at B dipole moment p = 2ed

  5. Er E P r2  r + (d/2)cos r1  r – (d/2)cos r (d/2)cos  +q -q

  6. dA +f + + + + + + + + +  -b   +b  - - - - - - - - - -f

  7. -q +q

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