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  4. Chapter 18 Magnetic fields
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Answers to Chapter 18 Problems

 

18.4.1  (a)  1.59 × 10–3 N;  4.77 × 10–3 N    (b) 4.5 × 10–4 J

18.4.2   62 mm

18.4.3   (i)  +5.6 A m–1      (ii)  â€“2.4 A m–1

18.5.1   \(  I  \over {2 \pi w}  \)ln\( \Bigl( 1+  {w  \over l} \Bigr) \) perpendicular to plane of strip

18.5.2   5.7 cm;   27.7 A m−1

18.5.3 

18.7.1  5.68 A m−1

18.7.2   14.0 A m−1;   11.2 A

18.7.3   (i)  3.6  A m−1    (ii)  7.9 A m−1

18.7.4   200 A m−1

18.9.1  (a)  BA = \(  4plx  \over {4 \pi  \bigl(x^2-l^2 \bigr)}^2 \)  ;   BB = \( 2pl  \over {4 \pi  \bigl(y^2+l^2 \bigr)}^{3/2} \)       (b) BA = \(  pl  \over  \pi x^3 \)  ;   BB = \(  pl  \over 2 \pi y^3 \)       (c)  32 μT;   14 μT 

18.9.2  1.3 mT 

18.10.1  (i)  3.17 × 10–4 N     (ii) 4.48 × 10–5&²Ô²ú²õ±è;N m

18.10.2 

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