Fall 2011 Homework 12 Solutions

Fall 2011 Homework 12 Solutions - Physics 21 Fall 2011...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 21 Fall, 2011 Solution to HW-12 27-36 A straight, vertical wire carries a current of I = 1 . 19 A downward in a region between the poles of a large superconducting electromagnet, where the magnetic field B has a magnitude of B = 0.591 T and is horizontal. What are the magnitude and direction of the magnetic force on a section of the wire with a length of l = 1 . 00 cm that is in this uniform magnetic field, if the magnetic field direction is (a) east, (b) south, (c) 34 south of west? The diagram shows the view looking down in the direction of the current, for an arbitrary orientation of B in the hori- zontal plane: N E S W B F mag I We use the right hand rule to evaluate the magnetic force F mag = I l × B , where l is a vector of length l , the length of the wire section, that points in the direction of the current. One can see that for any horizontal B , the magnetic force will also be horizontal, and its direction will be 90 clockwise from B . (a) For B pointing east, the magnitude of F mag is F mag = IlB = (1 . 19 A)(0 . 010 m)(0 . 591 T) = 7 . 03 mN and the direction is south. (b) For B pointing south, F mag is the same as in part (a), and the direction of F mag is west. (c) For B pointing east, F mag is the same as in part (a), and the direction of F mag is 34 west of north.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern