# Lect16 - " \$& F" qv B"" qvB qE E" 05...

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Unformatted text preview: ! " # ! \$ ((((((((( ! % & ) * F " ' ' qv B ((((((((( ) * ) * " % " + % % , qvB qE ) ! ) * E " ' 05 vB V vBL + % . ' V EL Two identical conducting bars (shown in end view) are moving through a vertical magnetic field. Bar (a) is moving vertically and bar (b) is moving horizontally. ! B Which of the following is true? A. A motional emf exists in the bar for case (a), but not (b) 0 ! B. A motional emf exists in the bar for case (b), but not (a) C. A motional emf exists in the bar for both cases (a) and (b) 1 D. A motional emf exists in the bar for neither case (a) nor case (b) ((((((((( % ( ) * ! ) * " # # \$ # \$ / ((((((((( 23 % 2+ ! A conducting bar (green) rests on two frictionless wires connected by a resistor as shown. 5' & 0 ! ' The entire apparatus is placed in a uniform magnetic field pointing into the screen, and the bar is given an initial velocity to the right. 1 The motion of the green bar creates a current through the bar A. going up 0 B. going down ! ((((((((( 7 % 6 ! ) * 3 " # # \$ # \$ 4 ((((((((( % 2 + 3! A conducting bar (green) rests on two frictionless wires connected by a resistor as shown. 5' % 0 ! The entire apparatus is placed in a uniform magnetic field pointing ' & & 3 into the screen, and the bar is given an initial velocity to the right. 1 The current through this bar results in a force on the bar A. down 0 ! B. up C. right 1 D. left E. into the screen " ' ( ) F F IL B P * vBL LB R Fv vBL LBv R I 2R 8 A wire loop travels to the right at a constant velocity. Which plot best represents the induced current in the loop as it travels from left of the region of magnetic field, through the magnetic field, and then entirely out on the right side? B=0 v B=5T Out of Screen 9 ' 5' 20 8 * ) ; 2! - , ' . * ) 2! * ) ' <! 23 . * ) ; 20 ' 2! - , . : A wire loop travels to the right at a constant velocity. Which plot best represents the induced current in the loop as it travels from left of the region of magnetic field, through the magnetic field, and then entirely out on the right side? B=0 v B=5T Out of Screen 5' 20 8 = ! A conducting rectangular loop moves with velocity v toward an infinite straight wire carrying current as shown. 5' / What is the direction of the induced current in the loop? A. clockwise B. counter-clockwise C. there is no induced current in the loop ! ! ) ) * * ! ! 20 > ? \$ ; ; 0. " ' !. . 0 1. A ! , ! 5 ' ' @ v B ' ' ' % % 5 22 3 ? \$ ; , 0 , -0. -!. - . -1. 23 2 48 2 >3 @ v B 23 - ' ' !. 2 EL 2 22 F L q 2 Lv B w 2 L( ) B cos 2 2 AB cos( t ) ? \$ ; A rectangular loop rotates in a region containing a constant magnetic field as shown. The side view of the loop is shown at a particular time during the rotation. At this time, what is the direction of the induced (positive) current in segment ab? A. from b to a B. from a to b C. there is no induced current in the loop at this time 5' 4 v B ) v B * ( ! 20 ' * + \$ # , , & / & 0 8 , # & 23B : C C C6 CA ' ' ' 2 B , ., = , @ % ' B ', I h x L v ' - 23B / ' , 'B ! CC C CD ' ! , , B ; 9 , 4 & 0 8 , , @ ' - 23B / ' % I h x L v 2 B ., , = ' B# ', &23B : . / ' % " \$ 0 1 8 & 0 8 , , @ ' - 23B / ' % ! I h x L ' v 2 B ., , = ' B# ', &23B : . / ' 2 2 3 v B & 0 8 , , @ ' - 23B / ' % ! I h x L ' v 2 B ., , = ' B# ', &23B : . / ' v B ' 3 ' , : & 0 8 , , @ ' - 23B / ' % ! I h x L ' v 2 B ., , = ' B# ', &23B : . / ' v B 3 = & 0 8 , , @ ' - 23B / ' % ! I h x L ' v 2 B ., , = ' B# ', &23B : . -0. -!. - . left 4 left o I Lv qvB qE B oI E vB o I hv Eh vBh 2 x left o I hv 2 x 2 x 2 x oI 2 ( L x) Lv > & 0 8 , , @ ' - 23B / ' % ! I h x L ' v 2 B ., , = ' B# ', &23B : . -0. right -!. - . 4 oI 2 ( L x) oI hv qvB qE B oI E vB oI Eh vBh hv right right 2 x hv oI 2 ( L x) 2 ( L x) 2 (h x) Lv 3 & 0 8 , , @ ' - 23B / ' % ! I h x L / ' v 2 B ., , = ' B# ', &23B : . -0. -!. - . loop 4 2 x 2 x o I hv oI 2 ( L x) oI hv hv I loop loop R loop o I hv 2 ( L x) loop 0 I loop oI 2 R hv 1 x 1 L x ,*D ' 0 8 , ' - 23B / 2 B ., , = ' B I h x ! ) * L ' ) * v . -0. -!. / E 5, 7 ,*D ' 0 8 , ' - 23B / 2 B ., , = ' B ! I h x L ' v . / 4 -0. -!. - . -!. -!. 1( 0" . \$ *2 %5 6 2 * # " ! ' ! / ...
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## This document was uploaded on 03/08/2012.

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