Final-Fall-2005-06-1

# Final-Fall-2005-06-1 - Physics 211L Final Exam January 2006...

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1 Physics 211L Final Exam January 2006 Name:________________________________ID__________________ Section: M-1 M-3 T-1 T-3 W-1 W-3 Th-1 Th-3 F-1 F-3 1. The magnetic field due to a long straight current -carrying wire is measured by means of a Tesla meter, which has not been properly zeroed ( Ignore the magnetic field of the Earth ). The magnetic field H and the probe-head distance from the wire d are recorded, with the following results: H (mT) d (mm) 3.42 2.0 2.26 3.1 1.80 3.9 1.55 5.1 1.32 6.2 The current is kept constant at 30.1 A; the ammeter tolerance is 2%. Write the relation between H and d . Choose the proper variables and use linear regression to find the permeability of free space ( 0 ) and the meter reading when it is very far from the wire. Compare 0 to the literature value x 10 -7 SI. (60%)

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3 2. How did you measure currents in the PHYS211L DMM experiment? (10%) 3. Why is the electron track visible in your PHYS211L e/m experiment? The electrons circulate counterclockwise, looking from above; what is the direction of the magnetic field? (10%)

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4 4. In your best PHYS211L transformer configuration the primary coil has 400 turns while
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Final-Fall-2005-06-1 - Physics 211L Final Exam January 2006...

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