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Physics4BExam3

# Physics4BExam3 - c What is the source of the B-field shown...

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0 DO NOT TURN THIS PAGE!!!!! Name: ______________________________ Physics 4B/Winter 2010 Exam 3 Make sure to show all work in complete detail! NO CREDIT will be given if NO work is shown!

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1 1. A wire carrying 1.5 A passes through a region containing a 2.0 T magnetic field. The wire is perpendicular to the field and makes a quarter-circle turn of radius 1 2 R as it passes through the field region as shown below. Find the magnitude and direction of the magnetic force on this section of wire. Use the coordinate system shown and take the +z-axis out of the page. (Hint: DO NOT INTEGRATE !!!) X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R I B in X Y
2 2. The figure below shows a non-uniform magnetic field that varies along the y-axis. At the top and bottom of the rectangular loop shown the field strengths are 3.0 T and 1.0 T respectively. a) Calculate the amount of current that flows through the area bounded by the loop. b) In what direction does the current flow?

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Unformatted text preview: c) What is the source of the B-field shown. B 6.0 cm 10.0 cm 3 3. The conducting rod shown below has mass M and length L and can move on two frictionless, parallel rails in the presence of a uniform B-field directed into the page as shown. The bar is given an initial velocity V i to the right and is released from rest at t = 0. a) Find the velocity of the rod as a function of time. b) Find the magnitude and direction of the induced current as a function of time. R L V i X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 4 4. A long, straight wire as shown below carries a constant current I . A metal bar with length L is moving at a constant velocity V as shown. Point ‘ a’ is a distance ‘ d’ from the wire. a) Derive an expression for the EMF induced in the bar. b) Which point ‘ a’ or ‘ b’ is at a higher potential? I d a b L V...
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Physics4BExam3 - c What is the source of the B-field shown...

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