110.HW8.Soln - Physics 110 Homework Set #8 Solutions...

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Physics 110 – Homework Set #8 Solutions – Chapter 14 Q7. We visualized the magnetic field of the earth by imagining that there is a bar magnet inside the earth (fig. 14.7). Why did we draw this magnet with its south pole pointing north? Explain. (2 points) The north pole of the earth is called that because the north pole of compasses point in that direction. Due to the nature of magnets, the “magnet inside the earth” must have a south pole pointing north to cause the magnets in compasses to point the right direction. Q15. If we look down at the top of a circular loop of wire whose plane is horizontal and that carries a current in the clockwise direction, what is the direction of the magnetic field at the center of the circle? Explain. (2 points) The magnetic field points into the paper. If we grab the wire with our thumb pointing along the current direction, our fingers wrap into the page through the middle of the current loop.
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This note was uploaded on 02/26/2012 for the course PHYSICS 302K taught by Professor Irenepolycarpou during the Spring '09 term at University of Texas at Austin.

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110.HW8.Soln - Physics 110 Homework Set #8 Solutions...

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