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certain derivations are wrongly done. For example please review the derivation of Az in page 417 (new book Reprint edition 2015-16)
Sir, There is a lot of mistakes in your derivation ... though at the end every derivation is derived correct ..... but in the starting or middle of each and every derivation there is a mistake ...... I will give you an example .... startin equation of field of small current derivation is wrong ... sir, proofread your book ... you will find them .... this might be editing errors ... but yes there are errors ... lots and lots of errors ...