Lect14 - dB I ds r ^ 2 4 r 0 dB I ds r ^ 4 r2 0 !...

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Unformatted text preview: dB I ds r ^ 2 4 r 0 dB I ds r ^ 4 r2 0 ! " Axis of Current Loop Infinite Straight Wire Field at the center of a ring dB I dsxr ^ r2 4 0 ^ r r r I ds dB ^ r r P ds d B P points out of page for each d s d ds r d d BP 2 0 I 2 d BP I ds 4 r2 0 I rd 4 r2 0 BP 0 dB 4 r d 0 0 I 2r # $ % ! " % # $ I # & + ' 1+ (" ) ,(( * # (+ * * -( ,#- , - % $ % - .% ./ .%#. #- .% . .%#. - .% .0 .%#. % & ) . . , 23 - % B # * * x x " ) ** 5 # # 6 * 7 89:; '- -< +- = * !-! >- ? 4 % $ + $ # F21 I 2 L B1 F21 I2 L o 2 d I1 % + $ ( $ + + % ** * ( @ + ' 7* ( 5 ' -= * -! +- $ !-B ; >- ? 5 ' -= * -! +- $ ) !-B ; >- ? ) * A + 7* C 5 ; ' -= * -! +- $ !-B >- ? 2 + % E B $ B ( $ ( D % ? E 3 + 7* C# 5 ' -= * -! +- $ ) !-B ; >- ? i ( i ( + 7* A current carrying loop of width a and length b is placed near a current carrying wire. How does the net force on the loop compare to the net force on a single wire segment of length a carrying the same amount of current placed at the same distance from the wire? A. The forces are in opposite directions A B. The net forces are the same B C. The net force on the loop is greater than the net force on the wire segment C D D. The net force on the loop is smaller than the net force on the wire segment E E. There is no net force on the loop + ( 0 ( 12 7* A current carrying loop of width a and length b is placed near a current carrying wire. How does the net force on the loop compare to the net force on a single wire segment of length a carrying the same amount of current placed at the same distance from the wire? ' + ' (, / , ' + (+ - +.& (+ , + ( A. The forces are in opposite directions A B. The net forces are the same B C. The net force on the loop is greater than the net force on the wire segment C D D. The net force on the loop is smaller than the net force on the wire segment E E. There is no net force on the loop C F + * B z R 1 3 z I & # 5 # 7 # B 'F ;; E E & Magnetic field of a dipole moment Direction of B reverses from inside to outside. B gets weaker B S N " " + " '- ' + * F * ( # ( * -< * " 7 7 7 # N S N S @ < F G ( ' D H +<B < F I ds r ^ 4 r2 0 < <B ! = +" qv B IL B B r F dB (! ( "# "3 3 C( ! ( % "3 "# ( 5 06 A + " * I ,F - * $ ( 5 * ; $ % ' x z y (> ' $ ' y . C J5 y y * y # * y $; y . z z . z . z . z . ,' - , - ,+ - ,! - ,> - 2 + " * I ,F - * $ ( 5 * ; $ % ' x z y (> ' $ ' y . C J5 y y * y # # y $; y . z z . z . z . z . ,' - , - ,+ - ,! - ,> - 3 + " * I ,F - * $ ( 5 * ; $ % ' x z y (> ' $ ' y . C J5 y y ; y y . z z . z . 90o z . ,' - , - ,+ - ,! - + " * I ,F - * $ ( 5 * ; $ % ' x z y (> ' $ ' y . C B J5 , ,' - ( F 3 J5 6 I 2 r 0 F " " K' , - &( F 3 * " # ,+ - 4( F @ y * " $; ; F . r 32 42 5cm C B I 2 r 0 (4 10 7 ) 1 40 10 2 .05 7 z + " * I ,F - * $ ( 5 1 4 ' +2 5 y (> ' ; $ % ' $ ' x z y . C * J5 ,' - C ( F y ; , " , - ( F A " F ,+ - 4( F " " K' ,! - A( F 3 " . & + B1x B1 cos Bx 2 B1 cos 2 4 10 6 z C , 4 5 6.4 10 6 B2 x B2 cos C ...
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This document was uploaded on 03/08/2012.

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