Magnetic Fields and Circuits 131 SAS2227425065409505036300rso At/Wb..1111 SAS333374350402 5063700rso At/Wb111111.. Total reluctance, so SSSS11111236552703 6306 370...SS2306.11At/Wb Ans (b) F S ampere turn 2 10 3 2.13 10 6 so Atand ampso A FFN4254425450085II. 1Ans Magnetic ﬂ ux, like most other things in nature tends to take the easiest path available. For ﬂ ux this means the lowest reluctance path. This is illustrated in Fig. 4.18 . The reluctance of the soft iron bar is very much less than the surrounding air. For this reason, the ﬂ ux will opt to distort from its normal pattern, and make use of this lower reluctance path. SNsoftironplasticcopper Fig. 4.18 4.13 Comparison of Electrical, Magnetic and Electrostatic Quantities Although a number of comparisons have already been made in the text, it is useful to list these comparisons on one page. This helps to put the three systems into context, and Table 4.1 serves this purpose.