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Unformatted text preview: 1 Page 1 17 ConcepTest on Amperes Law Which Ampere path has the largest value of ? (1) a (2) b (3) c (4) d PHY2049: Chapter 29 B d s B d s = 2 i 18 ConcepTest on Amperes Law Which Ampere path has the largest value of ? (1) a (2) b (3) c (4) d (5) e PHY2049: Chapter 29 B d s B d s = 4 i 2 Page 2 19 PHY2049: Chapter 29 Amperes Law For Straight Wire Lets try this for long wire. Find B at distance at point P Use circular path passing through P (radius r) From symmetry, B field must be circular An easy derivation r P 20 PHY2049: Chapter 29 Useful Application of Amperes Law Find B inside long wire, assuming uniform current Wire radius R, total current i Find B at radius r = R/2 Key idea: enclosed current proportional to area i enc = i 1 2 R ( ) 2 R 2 = i 4 B 2 R 2 = i 4 B = 1 2 i 2 R = 1 2 B surface r R 3 Page 3 21...
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 Spring '08
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 Physics

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