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Bộ tài liệu bài tập tham khảo môn vật lý bậc đại học bằng tiếng anh Chapter 28 | 28.1 For a charge with velocity r 8.00 x 106 m s j the magnetic field produced at . n . Vo qVx r a position r away from the particle is B - - . So for the cases below 4.v r a r 0.500 m i v x r - k r0 B -Vqik -Vo 6.0 x 10-6 C 8B x i mslk - 192 x 10-5 T Jt -B k 2 2 x n 0 1. b r -0.500 m j v x r 0 B 0. c r 0.500 m k v x r i r02 4. B i Bo i. 4l r02 0 d r - 0.500 m j 0.500 m k v x r - i r2 1 2r0 b o qv j_ Bo J_ BL 4l r2 72 2 72 2 2 28.2 Btotal b b l qvL 4n I d q v d2 p0 I 8.0 x 10-6 C 4.5 x 106ms 3.0 x 10-6 C 9.0 x 106m s 4 0.120 m 2 0.120 m 2 B 4.38 x 10 4 T into the page. 28.3 B . Ef 4n r a f vT f ri fx V . B 0 b f vi r rj f x vrk r 0.500 m B _ 11 l I _ 1 x 10 7 N s2 C2 4.80 x 10-6 C 6.80 x 105m s 6 T B I l- 1.3 1 x 10 T L4nJ r2 0.500 m 2 q is negative so B - 1.31 x 0 6 T k c f vi f 0.500 m i j f x f 0.500 m vk r 0.7071m B Iæ f x f r3 1 x 10-7 N s2 C2 4.80 x 10-6 C 0.500 m 6.80 x 105m s L4n J q x r 0.7071m 3 B 4.62 x 10-7T B - 4.62 x 10-7 T k d f vi r rk f x f - vrj r 0.500 m B IP01 q v 1 x 10-7 N s2 C2 4.80 x 10-6 C 6.80 x 105 m s L4nJ r2 0.500 m 2 B 1.31 x 10-6T B 1.31 x 10-6 T j 28.4 a Following Example 28.1 we can find the magnetic force between the charges qqvv zin-7 8.00x 10-6 C 3.00 x 10-6 C 4.50 x 106m s 9.00 x 106m FB 0 10 T m A - B 4n r 0.240 m 2 1.69 x 10-3 N the force on the upper charge points up and the force on the lower chai points down . The Coulomb force between the charges is F k 1 8.99 x 109 N mVC2 8 3 x 3.75 N the force on the upper r2 v 0.240 m 2 v rr charge points up and the force on the lower charge points down . The ratio of the Coulomb force to the magnetic force is 16 . N 2.22 x 103 -v v b The magnetic forces are reversed when the direction of only one velocity is reversed but the magnitude of the force is unchanged. 28.5 The magnetic field is into the page at the origin and the magnitude is B B B 4n r2 rn 4.0 x 10-6 C 2.0 x 105m s 1.5 x 10-6 C 8.0 x 105m s B ---I ----------------- ------1---------------- ------- 4n 0.300 m 2 0.400 m 2 B .
