HW05-solutions-1 - gilbert (amg3448) HW05 tsoi (57210) This...

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gilbert (amg3448) – HW05 – tsoi – (57210) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points When you go in to have an MRI done, the technician always tells you to remove your watch, pens, and other metal objects From your pockets. Why is this request made? 1. There is a weak electric feld in the MRI machine. 2. There is a strong electric feld in the MRI machine. 3. There is a strong magnetic feld in the MRI machine. correct Explanation: There will be a strong magnetic feld inside an MRI machine. This could damage metal objects into dangerous projectiles. 002 10.0 points The fgure represents two long, straight, par- allel wires extending in a direction perpendic- ular to the page. The current in the leFt wire runs into the page and the current in the right runs out oF the page. a b c What is the direction oF the magnetic feld created by these wires at location a, b and c? (b is midway between the wires.) 1. down, zero, up 2. up, down, up correct 3. down, down, up 4. down, up, down 5. up, up, down 6. up, zero, down Explanation: By the right-hand rule the leFt wire has a clockwise feld and the right wire a counter- clockwise feld. 003 10.0 points What is the underlying basis oF the magnetic feld in a magnetized piece oF iron? 1. The magnetic monopole in the atom cre- ates the magnetic feld. 2. The charge in the atom produces a mag- netic feld. 3. The motion oF electrons constitues an electric current which produces a magnetic feld. correct Explanation: The magnetic feld in a magnetized piece oF material is created by electrons that are moving (and spinning). This motion oF charge constitutes an electric current which produces amagneticcurrent. 004 (part 1 of 5) 10.0 points Along,straightwireisintheplaneoFthepage and carries a current oF 7 A. Point P is also in the plane oF the page and is a perpendicular distance 0 . 5mFromthewire,asshownbelow. P 7A 0 . 5m x y z z is upward From the paper With reFerence to the coordinate system in the fgure above, what is the direction oF the magnetic feld at point P due to the current in the wire? The permeability oF Free space is 4 π × 10 - 7 T · m / A. Gravitational e±ects are negligible.
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gilbert (amg3448) – HW05 – tsoi – (57210) 2 1. in the negative y direction 2. in the negative x direction 3. in the positive y direction 4. in the negative z direction correct 5. in the positive x direction 6. in the positive z direction Explanation: Using the right hand rule, the magnetic feld at point P due to the current in the wire points into the page, or along the negative z -axis; i.e. , ± B P =+ ± z. 005 (part 2 of 5) 10.0 points A2 . 324 × 10 - 26 kg mass particle with nega- tive - 1 . 12 × 10 - 18 Cchargeisin it ia l lymov - ing parallel to the wire with a 80 m / sspeed when it is at point P ,asshownbe low.
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This note was uploaded on 03/22/2012 for the course PHYS 302L taught by Professor Tsoi during the Spring '10 term at University of Texas at Austin.

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HW05-solutions-1 - gilbert (amg3448) HW05 tsoi (57210) This...

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