8_Chapter 19 HomeworkCH19 Magnetism

8_Chapter 19 HomeworkCH19 Magnetism - 148 CHAPTER 19 19.11...

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148 CHAPTER 19 19.11 From FB sin I L θ = , the magnetic field is () 3 0.12 N m 8.0 10 T sin 15 A sin90 FL B I == = × ° B G The direction of must be the direction z + to have F G in the – y direction when I G is in the + x direction. 19.12 Hold the right hand with the fingers in the direction of the current so, as you close the hand, the fingers move toward the direction of the magnetic field. The thumb then points in the direction of the force. The results are (a) to the left (b) i (c) nto the page out of the page (d) toward top of page (e) into the page (f) 19.13 Use the right hand rule, holding your right hand with the fingers in the direction of the current and the thumb pointing in the direction of the force. As you close your hand, the fingers will move toward the direction of the magnetic field. The results are (a) into the page (b) toward the right (c) toward the bottom of the page 19.14 In order to just lift the wire, the magnetic force exerted on a unit length of the wire must
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