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2017 November 16
 Chapter 3: Extensively rewritten.
2017 October 24
 Chapter 3: Section 3.8: Some new text and three new figures added.
 Chapter 3: Section 3.8: Some grammatical mistakes in first paragraph corrected.
 Chapter 4: Sections 4.15 and 4.16: A new problem (4.14.9) and its solution are supplied.
 Chapter 13: Section 13.12 (Some Remarks on the StarDelta Transform) added.
2017 May 20
 Chapter 6: Section 6.12: A correction made to one of the expressions following equation 6.12.2.
 Chapter 6: Section 6.12: Several subsequent unhelpful paragraphs deleted.
2017 April 14
 Chapter 5: Section 5.11: Line 3: Misspelling of “difference” corrected.
 Chapter 5: Section 5.11: Line 11: Misspelling of “energy” corrected.
 Chapter 5: Section 5.15: Paragraph 5: d_{1} in second capacitance corrected to d_{2}.
 Chapter 5: Section 5.21: Minus signs in equation 5.21.4 removed.
 Chapter 8: Section 8.5: Below equation 8.5.10: Punctuation improved of sentence beginning “Its time integral...”
 Chapter 9: Section 9.2: Line below equation 9.2.1: Added closing parenthesis after “it”.
 Chapter 10: Section 10.7: Numbering of equations changed throughout the section.
 Chapter 10: Section 10.15: Numbering of equations changed after equation 10.15.8.
 Chapter 12: Line 4: “if order” changed to “of order”
 Chapter 13: All equation labels reduced by 1.
 Chapter 13: Equation 13.6.11: “= 0” added to RHS.
 Chapter 13: Section 13.6: In the bridge circuit near the end of the Section, the central impedance changed from Z_{5} to Z_{6}.
 Chapter 13: Subsection 13.9.4: Changes to circuit drawings A and B.
 Chapter 13: Section 13.10: E changed to V in line above Figure XIII.14.
 Chapter 13: Section 13.11: Below equation 13.11.1: “alternative” changed to “alternating”.
 Chapter 14: Consistent fonts used for Laplace transform and inductance used throughout the chapter.
 Chapter 14: Section 14.1: Above equation 14.1.6: Reference to equation 10.4.2 changed to 14.10.2.
 Chapter 16: Fourth paragraph: five lines from bottom: “10” corrected to “0.1”.
2017 April 5
 Chapter 6: Section 6.11: Seven lines above Figure VI.11: “number turns” corrected to “number of turns”.
 Chapter 7: Section 7.3: Four lines from bottom of section: “2015” corrected to “2018”.
 Chapter 7: Section 7.9: Last line of paragraph 3: “q” changed to “Q”.
 Chapter 8: Section 8.5: Figure “IX.4” relabelled “VIII.4”.
 Chapter 8: Section 8.5: Line below Figure VIII.5: “them” corrected to “then”.
2017 March 1
 Chapter 3: Section 3.1: Several paragraphs of new material added.
2017 February 21
 Chapter 3: Section 3.7: Below equation 3.7.9: The word “to” inserted after “coordinates”.
 Chapter 4: Section 4.3: Three lines above equation 4.2.3: Definition of current density corrected from J/l to J/A.
 Chapter 5: Section 5.18: Two lines after figure V.24: The word “time” inserted after “some”.
2017 February 10
 Chapter 2: Section 2.1: Paragraph 3: “point” corrected to “points”
 Chapter 2: Section 2.2: Line below equation 2.2.16. “is” corrected to “in”
2016 December 21
 Chapter 16: Section 16.1: Page1: Three lines from bottom: “10” changed to “0.1”.
 Chapter 16: Section 16.1: Two lines after equation 15.1.5: “esu” inserted after “CGS”.
 Chapter 18: Chapter heading changed from “CHAPTER 10” to “CHAPTER 18”.
2016 December 14
 Chapter 15: Section 15.10: An unnumbered equation at the end of the section is now numbered 15.10.7
2016 September 6
 Chapter 15: Section 15.9: Material added concerning the impedance of a vacuum.
2016 January 11
 Chapter 3: Section 3.5: Page 5: Line 4: “component” corrected to “components”.
 Chapter 3: Section 3.8: Page 19: Line 7 from bottom: “dipole” corrected to “dipoles”.
 Chapter 3: Section 3.8: Page 19: Line 3: “componets” corrected to “components”.
2015 December 11
 Chapter 3: Section 3.7: New material added on calculating the dipole potential in terms of Legendre polynomials.
2015 October 29
 Chapter 7: Section 7.5: A few sentences added on the force on a magnetic dipole in an inhomogeneous field.
2015 February 2
 Chapter 13: Section 13.11 (RootMeanSquare Values, Power and Impedance Matching) added.
2015 January 26
 Chapter 4: Section 4.14: Additional circuit problem, problem 4.14.8, added to the collection.
 Chapter 5: Section 5.19: Much new material, including energy considerations, instantaneous change in current, integrating and differentiating circuits.
 Chapter 10: Section 10.15 (Charging C through R and L) added. Old Sections 10.15 and 10.16 renumbered as 10.16 and 10.17.
 Chapter 13: Section 13.9: New subsection 13.9.4. Deltastar transformation in alternating currents. Impedance of an unbalanced bridge.
2015 January 6
 Chapter 13: Sections 13.2 and 13.3: Changed the definition of capacitive reactance so that it is a signed (negative) quantity.
 Chapter 13: Section 13.6: A further worked example on impedance and admittance at the end of the section.
2014 December 23
 Chapter 5: Section 5.19: A new worked example on charging a capacitor at the end of the section.
 Chapter 10: Section 10.12: A new worked example on the growth of current in an inductor at the end of the section.
 Chapter 13: Section 13.6: A new worked example on impedance and admittance at the end of the section.
2014 December 17
 Chapter 6: Section 6.2: The proposed change in the definition of the coulomb, originally scheduled for 2015, has been deferred to 2018. I have changed the year in the penultimate paragraph of Section 6.2.
 Chapter 6: Section 6.12: Four important summary sentences added to the end of the section.
2014 May 18
 Chapter 3: Section 3.7: Typo "follwing" fixed above equation 3.7.6.
2014 May 4
 Chapter 3: Section 3.7: New equation 3.7.10c added, plus an additional sentence following the equation.
2013 January 10
 Chapters 1, 6, and 7: Sections 1.5, 6.2, and 7.3: Comments have been added concerning the proposed new definition of the ampère likely to come into effect in 2015.
2012 November 27
 Chapter 3: Some minor spelling mistakes corrected.
2012 November 25
 Chapter 2: Section 2.2.6: Greatly expanded with computational notes.
2012 November 9
 Chapter 3: Section 3.10 (A Geophysical Example) added.
2012 October 27
 Chapter 3: Section 3.7: Additional material given on the lines of force near to a large dipole.
 Chapter 3: Sections 3.8 and 3.9: Figures III.1214 relabelled III.1315.
2012 October 22
 Chapter 3: Section 3.7: Short paragraph added to end of this section.
 Chapter 3: Section 3.8: Paragraph 2, line 1: "possess" changed to "possesses".
 Chapter 3: Section 3.8: Clarification to the exercise and a hint for its solution.
2012 October 2
 Chapter 3: Section 3.7: An alternative and in many respects superior method for calculating the potential near to the dipole has been added, and some changes have been made to the algebraic notation for the coordinates.
2012 September 28
 Chapter 3: Section 3.7: Some additions to figure III.3.
 Chapter 3: Section 3.7: V now expressed in units of Q / (4πε_{0}L) not 2Q / (4πε_{0}L)) for both the "far" case and the"near".
 Chapter 3: Section 3.7: Reversal of subscripts in the definitions of R_{1} and R_{2}.
 Chapter 3: Section 3.7: Changes to labels of the isopotentials in figure III.10.
2012 May 19
 Chapter 1: Sections 1.10 and 1.11 deleted. The material is covered in Chapter 2, Sections 2.4 and 2.5.
2011 August 4
 Chapter 1: Section 1.6.3: Correction on the second line of the page 10. Thank you to Juan Irias.
2011 April 29
2010 December 14
 Chapter 6: Section 6.2: Addition of paragraph concerning proposed redefinition of the amp.
2010 December 8
 Chapter 4: Section 4.16 (Attenuators) added.
 Chapter 6: Section 6.6: Expanded to include field in the plane of a ring.
2010 November 5
 Chapter 1: Section 1.6: Expanded to include field in the plane of a ring.
 Chapter 2: Section 2.2: Expanded to include potential in the plane of a ring.
2010 October 27
 Chapter 5: Section 5.15: Under figure V.23, "spearation" corrected to "separation".
